I think he looks more like a Gray Treefrog. Try the test to see if he's the cuban. I personally wouldn't kill it if it is, just keep it as a pet in an aquarium or something, and buy a culture of worms or beetles or something. It looks very cute, too bad spaying frogs isn't an able thing. Then euthanizing wouldn't be a big alternative, but then again, it may be too much trouble. Anyway, best of luk.