My ACF died :( ... think it might have had bloat?

[AlbinoFroggy]

Hey,
I have housed my African Clawed Frogs for about a month or so now. From an earlier thread I mentioned that one frog "Squish" was bigger than the other "squash". I thought it was because I had a male and female, and the larger frog tended to eat alot more. Yesterday I noticed the smaller one wasn't moving as much and kept at the top of the tank on the surface in the leaves. I cleaned the tank and the smaller frog "squash" still wasn't moving alot, only into the tank and settled. Later when feeding, the larger frog ate, however the smaller one hadn't and didn't acknowledge that the food was in the tank, i moved some towards the smaller frog but still didn't eat.

Unfortunatly this morning i found it had died My boyfriend who knows more than me about amphibians had a look, we both agreed it's from something internal. We think he might have had bloat from the pet shop because he didnt have such an appetite as the bigger one and he didnt grow like the other.

I know alot of people on here will know more than us, so I would like to check/ here your thoughts on how it might of died. I took some pictures for you to see.