Im just talking about american bullfrogs. Sorry I didnt even thing about specifying that lol. I have a 55 that im gonna be using for now. I caught 6 tadpoles on Monday, one had front and rear legs, 4 had only rear legs, and one had no legs. Now one is pretty much a frog w/ barely a stub left for a tail and 4 have front and rear legs while the last one still doesnt have any legs. Ive kept them in a 10 gallon w/ a small area of land.