I haven't heard Monster make any noises ever since I got him, except for one night when he got out and was cornered by the cat he made some odd noise. I specifically wanted male so that I could hear him sing. I've gotten another one recently that I was assuming is female, but still no noises.

How exactly do you tell the difference? :/ If I need specific types of photos to show you let me know..here's what I have so far..

Monster:

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Newbie (Doesn't have a name yet):

Now this is the only pic I could get because this one does not like to sit still and is rather hyper
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Every time I tried to get a pic of his/her back it'd jump away so the best description I can give is that I'm not seeing much difference from this one and monster other than this one is much much larger and rounder. Nice thick plump arms and legs.

I did hear rumor that you can tell the difference by picking them up above their thighs as if one toad is grabbing the other, the male makes noise female doesn't. I didn't want to do this for very long because it seemed so mean so when I did it neither made a noise but Monster vibrated a bit, I didn't hear any noise though :/.