Yes, whether it is baked or unbaked you can freeze the crostata. If it has yet to be baked you can bake it frozen and just add 5-10 minutes on to the baking time until the crust is cooked and the middle is hot to touch. If it is already cooked and you have a few slices left you can freeze the leftovers. Reheating instructions are below as followed (and you may need to add a few extra minutes on to the reheat time.