I strongly recommend that you feed them food according to size. Your pacman may attempt to eat a pinkie, but he may become overweight.

My albino pacman frog had ingested something he could not swallow and developed a condition where his intestines were pushed out of its cloaca. It is easily treated with soaking the frog in sugar water and other baths. Your frog may be at risk to develop this condition is you attempt to feed it pinkies. Try crickets, mealworms on occasions, dubia roaches. They will also go after guppies, but this should only be given to frogs on occasions.

Good luck and I hope to see pictures of your pacman soon.