Re-add frog and cats to stable mutagen pool

[Chayot]

Mhm. I don't know too much about it, saw some players just getting turned into frogs/cats.
Don't know how it was administered but one moment they're human, the next they lose all their stuff and they're just a frog now.

While I concede this is probably fun if you're chugging down random drunks at the bar, expecting to die,
when some player is running around forcing this on you, it's probably not as fun.