Hmm not to come off as rude... But... Don't feed it mamals(rodents), avians(birds), reptilians or other amphibians. Its not very healthy for them and could transmit some sort of bug.
Its not going to eat crickets because if you read up on them(books?) pacmans are sedentary predators. Meaning they are going to sit there and wait for the food to come to him. Here are foods to feed:
1)Earthworms= High protein, low on fat.

2)Roaches: madagascan hissing roaches are easy to find.


Stay away from fish. Especially goldfish. Goldfish are not suitable food source for ANY kind of animal of any kind. It doesnt matter if the animal needs to eat fish. Goldfish are high in fat, low on protein, very un-nutritional, and may contain "bugs".
Feed your frog every 2days. If you feed LARGE earthworms only feed 3large earthworms. If you feed roaches. At most only feed 2 large roaches. Dont go by that thing "feed per once per week". Its not a snake. Its a frog, and its not healthy for it. It might not eat because of temps, low humidity, and inappropriate housing and bedding. Make sure you use natural soil or potting soil. I find eco earth and all that junk to be useless, messy, and gets stuck to the amphibians skin. Ived seen frogs get irritated by it trying to get it off them. Dont use sand, or gravel. Just go with normal potting soil that has no additives, no pesticies, no nothing. Just pure dirt. Provide a leaf litter, a shallow dish with water, and a hiding place.