Yes! Once you have dipped them and the chocolate has fully hardened, store in airtight container or wrap tightly in plastic wrap and place in a freezer bag. Store in freezer up to 2 months. When you're ready to use them, remove biscotti from the freezer and unwrap. Let it thaw on a platter or baking sheet until they reach room temp. This will keep any condensation from getting on the cookies and softening them.