I've been guessing the genders of my 2 White's tree frogs for a while now. Here's some information on them to try to guess the genders.

Fergo - My 1 White's, Fergo, will croak for about 4 seconds if I play a White's calling on my phone by the tank and Fergo will also do a little sound when my other White's sits on him/her. Fergo is 2 and a half inches long, about a half-an inch bigger than my other Whites.

Nelly - My White's Nelly is approximantly 2 inches long. Nelly croaks about 4-6 croaking sounds then stops then does it again when I play a White's calling. Nelly also does a sound when Fergo sits on top of him/her.

If you have any other questions in order to figure out the genders, please ask. I'm very anxious to find out!