There are frozen, fully baked, and frozen, par-baked sub rolls. The par-baked ones need to be finished in your oven before using. They’re an OK alternative to fresh baked. Another option is to see if there is a local retail bakery near you that can produce the sub rolls for you. This will give you the best flavored roll, without the need to slack-out, but they will not be as good on the second day, so you would need to purchase fresh on a daily basis. The frozen par-baked rolls can be used over a period of several days, and work well if you plan to use the fresh, possibly still warm, rolls to make sandwiches with, or if you plan to make oven baked sandwiches you can go with either fresh baked, frozen fresh baked, or frozen par-baked rolls as the warming of the bun in the oven during heating of the sandwich, will do an excellent job of refreshinging the buns.
Tom Lehmann/The Dough Doctor