Can you restart frozen friendship bread starter?

Yes, you can restart a frozen friendship bread starter. Thaw the starter in the refrigerator or at room temperature, then feed it with equal parts flour and water to reactivate the yeast. Allow it to sit at room temperature until it becomes bubbly and active again, which may take a few hours to a couple of days. Once it's lively, you can use it for baking or continue feeding it to maintain the starter.