I have 3 of these frogs and my males rarely eat, maybe 1 small/medium locust a week, the female however is very greedy and eats what she can get including the boys left overs! Have you tried putting them in seperate simple quarantine style tanks? (paper towel floor, aquarium backing on the outside, 1 fake branch, 1 fake leaf and a small water dish? Try them in that and put 1 or 2 crickets in and see if they go for them.