Once they reach about 2 inches, you dont need to feed them as frequently. Three days a week should do. How often are you feeding them? After the first month, once they reach about two inches, their growth rate slows down dramatically, and so does their metabolism. You may be feeding them more than they are capable of digesting, which will cause problems.

I keep my frogs on foam pads, if I notice they havent pooped in a while I remove the foam pads so that they are in only shallow water. Being in the water all the time seems to help them drop a deuce much easier.