Yes, uncooked turnovers (before adding egg wash) can be frozen and stored for up to 3 months. Spread onto a parchment lined baking sheet and freeze for about 1 hour. Once frozen, transfer to a freezer safe container and store. To bake from frozen - add egg wash and steam slit, then bake as directed above, adding up to 5 minutes of baking time to account for baking from frozen.