Ill never understand my frog

[cali]

One concept to consider would be the work done by Pavlov.
Conditioned response and habit formation.

I go through the same process when I feed my frog everytime. He (starting to think she), sits in my hand with zero issues- never tried to jump or bite. He used to hunker-down in his dugout when I reached for him, but I see that response less and less.
If he's unclear of your intentions, he may be more worried about being eaten himself than the snack that you're offering.
Whatever interaction you have with the frog- make a pattern of it.
When you remove him to feed, do it at the same time of day (might want to think of this through his eyes- by the sun's position, not the clock).
Approach the cage from the same angle. Remove anything from the cage (water bowl, hide, etc) in the same order.
Place the frog in the same location for feeding- with the same items visable to him. Offer him the same food.
Do all of this in the same amount of time. Pacman's DO have memory and CAN understand their surroundings and previous experiences.

[GrifTheGreat]

Cali makes a valid point here. Pacman Frogs do NOT like change and will become stressed if thing change in your behavior or his surroundings. keep that in mind.

You can try soaking him in a luke. warm bath of de-chlorinating water and add 4 drops of honey dissolved in the water. this provides an energy boost as well as helps them poop. Just something to try. The water should be no deeper than up to his chin.