Heh I wasn't going for a particular species, just noting that it probably had something to do with poison frogs. The Japanese text under the image mentioned something about poison but I didn't feel like deciphering it (not that I probably could)
Actually, I believe she is dressed as a gila monster. It's a type of poisonous lizard. The suit's color and head look closer to a lizard than a frog, anyway. I think this is the case strongly enough to suggest that the frog suit tag be deleted.
It's a frog. Artists comment says something like: Asakura is cosplaying as a golden poison frog (モウドクフキヤガエル), whose poison from a single individual is said to be able to kill 190 adult humans. The SOS Brigade has done tree frog, bullfrog and amazon horned frog, so Asakura has has to do this as well. … But Asakura defeats her rivals with poison, so those who specialize in physical attacks should look out.