These cockroaches (Blaptica dubia) are an excellent food for frogs like Pacman frogs and African Bullfrogs. I tend to employ the 15 minute rule - give them as much as they will eat in 15 minutes. For young frogs I would feed them every 1-2 days if they are being maintained at a warm temperature - adults every 3-5 days. Those are just guidelines. Cockroaches are not a fattening food so don't be afraid to give more.