|Proceratophrys boiei is not a leaf|
|Cycloramphus lithomimeticus is not a wet stone|
|Scythrophrys sawayae is not dried leaf-litter|
Cycloramphus lithomimeticus is in the family Cycloramphidae
Proceratophrys boiei is in the family Odontophrynidae
Scythrophrys sawayae is in the family Leptodactylidae
Odontophrynidae used to be lumped in with Leptodactylidae until 2006 DNA data suggested that they were a) a clade - a group of species descended from a common ancestor b) longtime separated from the Leptos. Thus the evolutionary strategy of trying to look like something else has been re-invented multiple times . . . because it works.