I am aware that some people have some troubles with getting baby hognose to eat, but the majority of the ones I have hatched take pinkies right off, sometimes in only a few days. The ones that eat first I keep, and have been doing so for a great many years...So the eating problem might run in bloodlines, and certainly using first feeders for hold backs for the next generations should produce more and more good mouse feeders.
Occasionally they will eat once or twice then stop. Brumation is sometimes the key, as this would be normal for them in the wild where they'd be lucky to eat once or twice before winter.
Here's a 5 day old nasicus eating a live pinkie