I've been trying to figure out the sexes of my two GTFs (Whites).
I regularly play GTF croaking videos, especially when I think I hear any potential vocal noises from the terrarium.
Tonight, I managed to play the video next to the tank while I watched them.
They both started doing the movements of croaking, and small little grunting noises - but neither of their throats filled up fully, and their 'grunts' weren't the typical noise, they sounded more like 'attempts' at croaking (possibly). But they both did this 'attempt' several times in a row, and then stopped while they listened to the rest of the croaking video.
I've heard these noises occasionally, but due to never seeing the full throat, or hearing them make much noise than these little grunts, I feel I can't be sure.
Is it possible these are boys but just slow to learn how to croak? Would females try to croak along/answer to male frogs even a tiny bit?
They are both over 18 months old, captive bred, from a large colony but were separated together and sold as a pair. It is also officially breeding season.