Yes, you can freeze biscuits and gravy. Transfer the sausage gravy to a freezer-safe container and freeze it for up to 3 months. Thaw in the refrigerator overnight and reheat on the stovetop slowly until it comes to a simmer. Freeze the biscuits separately in a Ziplock bag and thaw at room temperature or in the fridge. Reheat biscuits in the oven or microwave until heated through.