If your pipes are frozen, water won’t be able to flow—meaning your toilet won’t be able to flush properly. In basic terms, toilet bowls flush when water rushes in from the toilet tank. If the pipes are frozen, your tank won’t be able to refill after a flush. You can keep adding more water to the tank if you have access to running water with frozen pipes, but it’s certainly not a long-term solution. Your best bet is to figure out how to unfreeze your pipes and get your toilet back to tip top condition.