Much of the literature which is available will tell you to vary the diet as much as possible. I am familiar with people raising huge, healthy horned frogs on pure goldfish diets. When my solid green cornuta was small, it only accepted crickets. I tried various types of worms and fish, but they only accepted crickets. During this time I was concerned with my frog having a lack of d3 calcium so I tried to dust at least 3 out of 4 feedings per week. After a while I got tired of the smelly crickets that would die so easily. I decided to try something new for my frog and bought a colony of lobster roaches. When properly gutloaded they are much more nutritious than a cricket, and they have a softer carapace compared to other roaches, making them easier to digest. I dusted them and threw them in with my cornuta and he was snapping them up eagerly. 6 months after it had been in my posession, I got my cornuta to accept a live pinkie. I have since converted it to eat f/t pinks (it wont accept the pinks all the time) as a secondary feeder from its staple diet of lobster roaches. My best advice is to offer as many different feeders as possible and closely monitor the manner you offer the food and the time you feed. My cornuta only accepts the pinks when I offer them late at night in complete darkness when it isnt aware of my presence (cant see me or the tongs). I drop the pink directly on the nose area of the frog and it usually triggers the frog to bite what is falling onto it and swallow it once it recognizes it as a food item. Dont try this too often as it may stress your frog out. Whatever you do, dont give up! It may take months, or even years to get your frogs to accept different foods, but you want what is the best for their health. Variation is the key, I just recently converted my large albino which only accepted goldfish to accept f/t day old quail chicks. His growth has since taken off.