Added Safe Start now have white fuzz

For 2 ADF you need like 5 gallons at LEAST! Bigger the better though, they would do best in 10 gallons and bigger.
The fluff might be from waste, dirty ornaments, disease.. I don't know it's hard to tell. Pictures and water parameters and a better description (frequency of tank cleaning, diet etc) would help.

FOr now, I highly reccommend a larger tank.

The fuzz is probably unrelated to the product you added unless you dumped in a huge bottle or something.

A 1.5 gallon is too small for your frogs and also to small for a beginner to keep properly cycled (which is what the SafeStart is for). I'd upgrade to a 5-gallon, it sounds like water quality in the 1.5 is deteriorating. How strong is the filter? Sometimes scum builds up if the filter is undersized for the tank.

Good luck!