Wanted to add that you will have better results by offering a variety of food, than to base frogs diet on a staple item.

Another thing to consider is that when predators eat their prey they eat the whole thing including stomach contents and all internal organs. Unless you have a source of whole, uncleaned Tilapia; feeding pieces of Tilapia meat will not contain the same nourishment of whole ones.

The same concept goes for any type of meat on a predator diet and that's why many owners offer a variety of items and use vitamin and amino acid supplements. Good luck!