Yes, you can freeze these croissants before air frying them. To freeze, place the unbaked croissants on a baking sheet lined with parchment paper and freeze until solid. Once frozen, transfer the croissants to a freezer-safe container or bag and store them in the freezer for up to 3 months. When you're ready to bake, allow the croissants to defrost in the fridge and then air fry as directed in the recipe.