I actually think I heard some calling from one of mine too. It was quick calling in succession but high pitch. Not sure if it wasn't one of my other frogs sounding funny, though.
Hehe, pretty good....
Aw man that is a bummer, at least you know they are males though. I can never trust the silent ones... I always suspect they are just screwing with me, trying to make me think they are girls.So I now have a confirmed trio of ...ALL MALES! Damn anybody end up with no calling, let me know I can hook you up.