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Besides My Little Panzer, there’s Happy Fun Ball and Improbable Weapon User. The latter has a few subtropes that qualify as weaponized toys. See also Killer Teddy Bear and Wicked Toymaker.
See also Nerf Arm
My Little Panzer is the closest thing to what I'm looking for. I'm designing a character (Shuelle) that has a Stand-esq ability that lets her control toys from the toy store she works at. Under her power, the toys go from normal to genuinely dangerous. Eg: A toy airplane can now shoot real bullets and drop real bombs.
I know there are tropes about equipping remote-controlled toys with real weapons, but is there one specifically about using toys (of any kind) to attack people? Maybe a toy gun that shoots real bullets or stuffed animals with real claws?