There's a bug with froggit and the ability that Marv gives you, if you confuse the froggit the tongue starts acting up & duplicating, and if you get caught it can insta-gulp you and softlock the game.
Also, this has only happened once, but upon loading a level in Fungal Forest, I came across a froggit that would not move or attack, and it was stuck on a frame with its mouth open. Kind of funny, but pretty harmless as I could still knock it out and eat it.