Yup, that does take us back to the OP.
Did acarman do regular partial water changes on the frog tank?
Did acarman feed frozen or live brine shrimp to the frog? If live brine shrimp was used, did [he] tip the brine shrimp water into the tank with the shrimp?
These are the important questions. As salt is not removed by evaporation, just topping-up with fresh water will only lead to greater quantities of salt being added to the frog's environment.
“Did anyone use any chemicals around the tank, flysprays, paint, perfume, etc..? Do you use a clean fish only bucket for water changes or do you just grab any bucket out of the laundry?”
One can only hope that the OP knew all about that basic stuff... I'm sure he did...