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These pics show one of my guys (sHEila) puffing up before a croaking session, mid session, and after his belly and throat deflated. I thought I had a much better one showing him from the top when he was all blown up, but I couldn't find it.

Now, my Jelly Bean also seems to be doing everything normally like your frog, but the last couple of months he's way more "blown up" than usual too (he's been calling more frequently too though so ?) Jelly Bean is a young adult but still very small for all his rotund look.

Does your frog look like this?
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Jelly's started to look like such a little Buddha frog I've put him on a diet!