Ok, I have an idea of figuring out if its a he or a she....or a heshe.
Anyways, buy 3 frogs. A girl frog, a boy frog, and a gay frog. Put the girl frog with ur frog and see what happens. If that doesn't work, let her go and try the boy frog. If that fails too, let him free and you are left with 2 gay frogs. Congratulations.