History Manga / SgtFrog

* BleachedUnderpants: Sort of. Space Policewoman Poyon-chan began her career in one of Yoshizaki's doujins, wearing only her UFO skirt and three small adhesive stars. Yoshizaki himself is much in demand as a pin-up artist (see his book Mine Blue for examples).

* RecycledSoundtrack: In Episode 7b, when Keroro and Mois are watching the ''[[Series/DenjinZaboga Denjin Zaborger]]'' parody, the track that plays is [[https://www.youtube.com/watch?v=PwAWdN10UUs a stock track]] that Sunrise has used in their other shows [[note]] Episode 135 of ''Manga/{{Gintama}}'', Episode 1 of ''Anime/MobileSuitGunplaBuildersBeginningG'' and the pilot film for ''Kanzen Shouri Daiteioh'' [[/note]], with its most notable usage being used as the Super Pinch Crusher theme in ''Anime/{{Scryed}}''.

* CrouchingMoronHiddenBadass: There is a reason Sgt. Keroro is the leader even though he ''appears'' to be a fool. Threaten (or worse, actually hurt) his squadmates or his adoptive family, and there's no force in the universe that will stop him, [[spoiler:as the Garuru Platoon found out]]. Or just get him too wet. See BerserkButton far above.

*** In one chapter of the manga, the platoon goes way too far by converting some old Children's Day carp flags (which Fuyuki considered a family heirloom) into invasion weapons. Fuyuki snaps, prompting Natsumi to genuinely panic, and Kululu quickly zaps him with the age reduction beam. [=Child!Fuyuki=] promptly ''takes charge of the invasion''.

* BilingualBonus: In the Japanese version, Tamama is filled with 嫉妬/しっと, pronounced [[ToiletHumor "shitto"]] and meaning jealousy/envy. He makes some sort of energy ball with his feelings and shooting it towards someone who angered him. The ball [[CarryingACake never reaches its destination though]], and usually [[HoistByHisOwnPetard returns..]]
** Which on one occasion led to the use of GratuitousEnglish which led to [[https://static.tvtropes.org/pmwiki/pub/images/vlc-2010-09-21-16h57m40s196_1532.jpg the logical conclusion.]]

Originating as a gag-manga by [[http://mnet.nicomi.com/index2.html Mine Yoshizaki,]] which began serialization in ''Shōnen Ace'' in 1999, and every bit as goofy as its title would suggest, ''Sgt. Frog'' is the story of a not-so typical Japanese family and the alien frogs who turned their lives upside-down.

Of course, Keroro is still an invader, and still plotting the downfall of "Pokopen/Pekopon" (his species' name for Earth in the manga/anime)... when he's not doing chores for the Hinata family, or being distracted by such aspects of Earth culture as ''Franchise/{{Gundam}}'' model kits and the Internet. Before long, Keroro manages to reunite with his squad-mates: hot-headed rookie/Keroro fanboy Private Tamama, hard-boiled combat specialist Corporal Giroro, and smarmy intelligence officer Sergeant Major Kururu/[[SpellMyNameWithAnS Kululu]]. With this eclectic crew ([[MyFriendsAndZoidberg plus some hippy ninja named Dororo]]), Keroro attempts to conquer the planet through one [[ZanyScheme convoluted scheme]] after another, though sometimes he feels torn between his mission and his obligation to the Hinata family... but not that often.

Insanely popular in Japan, the manga was eventually released in North America in 2004 by Tokyopop, with the title ''Sgt. Frog''. An anime adaptation naturally followed, and it aired from 2004 to 2011 on Creator/TVTokyo for seven seasons. In November 2006, Creator/{{ADV Films}} announced that they had acquired the rights to the anime adaptation; however, after nearly two years without a single word on the project save for a couple of trailers, Creator/FUNimation acquired the distribution rights in 2008 (along with about 30 other ADV titles). After a bit more DevelopmentHell, the first season 1 DVD was released September 2009. By March 2010, all of the first season had been released on DVD - split into ''two'' "seasons" for whatever reason. In February 2011, Funimation announced that it has licensed further seasons and would continue the dub, but production came to a standstill after the completion of their third, and no further dubbing was done. However, another, more faithful English dub provided by Animax aired in a few select countries of the series' birth continent and covered the whole series.

Originating as a gag-manga by [[http://mnet.nicomi.com/index2.html Mine Yoshizaki,]] published in ''Shōnen Ace'' starting in 1999, and every bit as goofy as its title would suggest, ''Sgt. Frog'' is the story of a not-so typical Japanese family and the alien frogs who turned their lives upside-down.

Rounding out the cast is an assortment of eccentric humanoids, including Momoka Nishizawa, bi-polar scioness of a multi-billion-dollar international corporation who hangs out with Tamama and has a serious crush on Fuyuki; Mutsumi Saburo, a smooth talking poet/artist/radio show host who hangs out with Kululu; Koyuki Azumaya, NewTransferStudent and {{Ninja}} girl who hangs out with Dororo and is a [[PseudoRomanticFriendship rather close]] friend of Natsumi; and Angol Moa/Mois, a ditzy alien girl who has a crush on Keroro and the power to destroy an entire city block with literally a fraction of her power. And the ghost haunting the basement is somehow one of the ''[[UnusuallyUninterestingSight least]]'' [[UnusuallyUninterestingSight bizzare characters on the show]].

Surprisingly, for a series that's not meant to be taken seriously, often has NoFourthWall, and is frequently brimming with pop-culture references, it has a lot of heart. Though it stops far short of being sappy, there are many heartwarming moments sprinkled in that sometimes constitute TearJerker material. It's still firmly in the comedy genre, though, and hence, occasionally brings these scenes to an abrupt halt with a quick joke.

** [[Anime/KemonoFriends Serval, Tsuchinoko and Recticulated Giraffe]] make shirt appearance at the end of a chapter.

** Giroro's voice actor also played Leonidas in the Japanese dub of ''Film/ThreeHundred'', which is quite appropriate, as they are both badass warriors or violent, cryptofascist lunatics depending on your point of view. At one point Giroro even [[MemeticMutation utters the film's most memorable line]].