The worst thing that usually happens is freezer burn, but that can usually be fixed.
if the ears are freezer burned it makes it a tremendous pain on the taxidermist some can replace them others will not most will tell you to get another coon
my suggestion is to get a hide tanned asap
it costs very little and will last for a very long time
when properly tanned they will outlast you and possibly your kids
the freezer is a good place to store hides but i would suggest less than 3 months and do your best to stop the air transfer on a hide(plastic wrap, towel, trash bag, vac pack, etc) the more you do to prevent freezer burn the better