Frogs are fine together. In fact, they do better in groups.
As long as your Gourami doesn't get aggressive or pick on the frogs, then they'd be fine together. Just MAKE SURE that the frogs are getting enough to eat.
Well, I have a few cory cats and 1 dwarf gourami in a 10-gal, and I have 2 ADFs I'd like to add back to the tank. They are in a gallon container now. I'm just trying to consolidate where I can.
Gourami prolly would, and you have lots of corydoras, so the activity might serve to stress the frog. You can quote me on that, I'll just deny having said that when accused.