Yes, you can freeze the star bread before or after baking it. If you freeze it before baking, shape the star and place it on a parchment-lined baking sheet. Once it's solid, transfer it to a freezer-safe bag or container. When you're ready to bake, place the frozen star bread on a baking sheet, let it thaw and rise for a few hours, and then bake as directed. If you prefer freezing it after baking, allow the bread to cool completely, wrap it tightly in plastic wrap and aluminum foil, and freeze. To serve, defrost the bread at room temperature or gently warm it in a low oven.