Hi:

General rule of thumb for PacMans & African Bullfrogs I have heard is what ever they can eat in 15 minutes. My Pacman has not eaten for 2 days. Today he ate 5 crickets, and then snubbed his nose at any further offering. Don't worry so much on number or portion size. I know your frustrated, but keep trying.

Possibly spreading your feedings out to every two days, you will find him more hungry.
Last week my guy ate 12 crickets in one sitting, today he just made 5. He is also very sensitive to people being to close or if there is to much commotion in the room. I believed I posted in the past I generally feed him at 11:00 pm when the house is quiet, and I literally have to be at least 4 feet away from his "feeding Chamber" before he will eat. If I am to close, forget about it.

Maybe its is just my frog, but he is very tempermental.

Hope all works out.

Chris S