thanks for the replies,

Terry, I actually have my MS in Biology and I did a fecal exam- but unfortunately all I have at home is a magnifying glass. I didn't see any worms. I'm sure if it had protozoan parasites it would be lethargic and the stool would be runny- not the case. Again i bought it at petco, but it seems like they do a good job of keeping the water fresh. However thats why I thought kidney disease in the first place, due to the buildup of nitrogenous waste in the water bowls. Its very strange, when the frog is moving it looks fine, but at rest it looks plump, much more than my other whites. Both are males but the one in question is considerably smaller (3 vs 2 in. SV), it just started croaking the other day. Another thing, i said previously that it wasn't soaking. I should have stated that prior to introducing it into the tank with my other whites it was soaking, but once in there seemed hesitant to soak. Now that I have re-quarantined its soaking again! Which got me to wonder ...since they're both males, could it be a territorial thing? Since the smaller one was introduced into the bigger frogs domain, might the little guy be reluctant to "share" an important resource such as a water supply? I mean everything really points to a healthy frog, it croaks, is now apparently soaking again, just took a nice solid poop a few min ago, and is bouncing around the cage, and eats like a monster. At times it just looks bloated. I dunno.