We use a commercial-grade high-protein pellet. They only need one pellet to get the protein that they require. This allows for the twice-a-week feeding. If you notice fighting behavior when you feed them, you can add an additional day and feed them three times a week but nutritionally they only need twice a week.
Our frogs do like the occasional treat! On a non-pellet feeding day, live Black Worms (NOT BLOOD WORMS), Frozen Brine Shrimp, or Frozen Mysis Shrimp are great treats for the frogs. Take the frozen cube and drop in 1/4 of the cube. Save the rest in the freezer for the next treat!