Can you freeze these and bake them?

Yes freeze, dont' thaw, bake straight from oven, same temp, maybe 5 minutes more (watch near end and take out when visibly done).
see tips at end of this article.
ttps://www.themediterraneandish.com/spanakopita-recipe-greek-spinach-pie/#:~:text=Leftover%20Storing%20and%20Freezing%20Tips,need%20to%20thaw%20in%20advance.