This guy could tackle prey almost as large as himself. I remember making the mistake of putting a slightly smaller pac man frog in with it....lasted about a day.
I really want to get ahold of some tadpoles of these guys. They are predatory, and will eat minnows and guppies. If anyone knows a breeder or source for pairs or tadpoles, please LMK.
Here's a pic I found on the web of a tadpole that's nearly formed...