How can get my frog to eat?

I recently caught an American bullfrog at my grandparents pond. It is about 150ft by 75ft and there is grass in some places that is 7 feet tall, the bank is gradual with a 45 degree incline. The water us very warm and there are NO fish in the pond due to an oil leak 50 sum years ago but now it is thriving with frogs. There are dragonflies and small beetles on the waters surface. There are about 2-3 large tadpoles in 5 cubic feet of water. The pond is 12 feet deep on one end and 3-4 feet deep on the other end. I tried to feed him some bugs and a large worm but he was only interested in getting out of a 10 gallon aquarium that I put him in to feed him. How can I get him to eat something? What should I be feeding this frog (3.5 inches excluding leg length) and how should his cage be set up (36"x18"x21")? 21 inches high. Please answer quickly because he is in a small 2 gallon bucket with some pond water in it.