Can I put a african dwarf frog in my tank?

I have a 50 gallon fish tank. There is 1 pleco (small), 4 corys (small), about 15 Black Kuhli Loach, and 20 tetra. The tank has plenty of filtration, lots of live plants, and everything is very healthy. I was wondering if I can add an dwarf frog to my tank. Will they be fine with all of the other bottom fish? And should I put 1 or 2 if the frogs in?