Can you use the same method to determine the sex of a Leopard Frog, too, or is it different for those guys? I really want to know what me Leopard Frog Tadpoles are, my larger one is starting to form the tympanum already. I call that one a girl, just because she is larger, but I really have no idea what they are. If I can use this method to sex them, I would be thrilled! Oh and about the "bump" on the bullfrog tadpole, it may be the sprical (or gill vent). Which I just learned about a few weeks ago as well. I thought my babies had a parasite that was boring into their side, lol. I felt really silly when I found out it is a natural part of the anatomy of a tadpole. Good luck with your baby! He is cute!