1.make sure both the frogs are the same species, I would start by calling the person you got them from, assuming there tadpoles have morphed as well, they may have positively identified them already and hopefully we'll be able to tell you that they're both the same species. Mixing frog species is a big no no. Frogs excrete toxins of various levels of toxicity, most are harmless to people with a few exceptions, so putting two different species in the same tank could one or both frogs
Could kill one or both frogs!!!!