When I feed my Pacman a bunch of Pac Attack pellets...two days after feeding...I notice that my frog is bigger than he's ever been.
He's not just full of food and pee, but also full of air. Almost alarmingly so.
I can see by lightly touching him that he can inflate defensively inflate a little more...
But good lord, a few days after eating a bunch of pellets, this fellow blows up like a balloon.
It's not water. It's air. He sounds hollow. It's as if he cannot or will not deflate himself.
Give it a week, he's back to normal. In time for another feeding and another round of "oh my god this frog just went up a notch"
About six months old. I suppose he is, in fact, going up a notch on every feeding.