Not to throw more wood in the fire but are they adult dumpys? and could it be possible that the person who had them prior could of just been feeding mice? Feeding strictly mice to amphibians has a tendency to cause cataracts in some frogs.. Just a thought. But if it is a bacterial infection, see if your local vet has Baytril(5% solution used for dogs).. Hopefully thats all it is. Best of luck.