If you don't know what your doing, I would strongly reccomended taking them to the vet for this. He/she should treat the frogs with metronidazole (orally) for protozoan parasites and with fenbendazole (orally), but not at the same time. I know Paul will suggest dusting their food with these medications, but my vet (who is also my boss) will tell you that by doing so, you are under dosing and this will lead to drug-resistant parasites. The drugs can be used about a week apart or so from each other. About three days after a dosing, the substrate should be changed. For this reason, I use paper towels in quarantine set ups. They are simply and cheaply replaced. They also allow you to monitor fecal out-put and health of fecal samples.

I would also keep a log in this time period. Log any thing unusual, feeding habits, appearence, anything that might seem worth noting. If there is a problem this will help the vet make a proper diagnosis.