That's exactly what I thought too. I thougt for sure at the end he would throw off the mask, pull out a badge and be like, "Isle Delfino Under Cover Private Eye! Hands up suckah!" or something like that (probably not the hands up suckah, but, you know).
If Toad is a mushroom and a mushroom is a fungus, can we say that Toad is a fungus?