Pacman frogs don't generally "hunt" anyway. If hungry enough they will take a few hops to get closer when they are young, but generally they sit in one place and just wait for the food to come to them, especially when they are adults.

Your safest bet would be to use pinky mice, or a frozen/thawed mouse. I feed frozen thawed because they are a larger meal, no (or very little) risk of parasites, and no biting, plus they are very convenient since you dot have to care for them if you are waiting to feed them off.

Best of luck!