I am in no way an expert but from what I have read Phoenix worms seem to be pretty healthy for frogs. I would also suggest nightcrawlers (cut to an appropriate size) as well. I have been researching a lot and I have learned that variety in their diet is good for frogs. Also Waxworms, Mealworms, and superworms should only be fed sparingly as treats due to their lack of nutrients and the amount of chitin. If I am wrong feel free to correct me as I am still learning! Hope this helps!