I don't know much about tiger leg monkey frog but I can answer the crickets. I have 3-4 dozen crickets roam in my tank with my grey tree frog and I don't see a problem with it. If he was in the wild he would hunt for his food. So I say you could put any amount in there with the frog. mine eats when ever he is hungry. I always keep extra food in his tank. he doesn't mind it.