mine make those squeaky noises, too. i think it's their feet rubbing against the bottom of the tank cos they're trying to dig so deep, at least that's what it sounds like. if your frog croaks, you'll know it. it's the silliest/cutest sound. it may be too small to determine it's gender, but someone with more experience than myself may be able to tell. i have one that's about the same size as yours and i can't tell at all cos it hasn't made any noise other than feet squeakies.