It is perfectly natural for pawpaws to be slow to “peak their heads up out of the ground.” I’ve mentioned this in other threads. Some scientific publications indicate it can take up to TWO YEARS before pawpaw seedlings poke up out of the ground! Their first year, they are busy dropping their notoriously fragile tap root.
Sounds like yours are in pots? Or are they in nursery beds?
Can you surround the pots with lots of dirt or mulch? This might help keep up the ambient humidity and ward off any chilly drafts from freezer-burning the roots.
Pawpaws like deep soil and humid conditions. They don’t like to be moved. They don’t like to be fall planted. Good luck.