My adult bullfrog can eat 10 medium crickets in one sitting. Probably more if I'd let her.
The little guys that are about 2-3 inches or so only get 3 or 4 medium crickets each. Sometimes 5.
I give them roaches sometimes. But I run out of those pretty quick because they are mainly fed to my bearded dragons. Once they are bigger I'll have more of the correct size to feed my frogs.
I'm happy your frog is eating well. I love it when they attack fingers. It's adorable!