The answer to 'bathtub frozen' is that a frozen bathtub is a common problem in colder climates, typically caused by a lack of insulation or a drafty bathroom. Symptoms include the tub not draining properly, water not running, and potentially cracked or burst pipes. The solution is to thaw the tub and pipes as quickly as possible to prevent further damage.
For minor freezing, you may be able to thaw the tub yourself by running hot water, using a space heater, or applying heat pads. However, if the pipes are frozen or the issue is more severe, it's best to call a professional plumber who can safely and effectively address the problem.