The little guy really needs bigger prey.
It is not unusual for them to be intimidated by bigger prey the first few times, just be patient and keep trying. If pinkies are what he wants, at least try rat pinks which are bigger. If you can find feeder rats of the correct size, he'll do much better on rats than on mice, fewer prey items with more food volume, if that makes sense.
Crawler rats are generally good for timid ball pythons as compared to hopper mice. They are about the same size, but hopper mice are called that for a reason, they jump all over the place and can really intimidate some baby balls. Crawler rats on the other hand, move around, but are not nearly as spastic as a hopper mouse.
Gale