The answer to 'drain frozen' is that a frozen drain is a common problem during the winter months, caused by water freezing in the pipes. Symptoms include slow or no water drainage, gurgling sounds, and potentially water backing up into the sink or tub.
The best solution depends on the extent of the freeze. For a minor freeze, you may be able to thaw the pipe by pouring hot water down the drain or using a drain snake or plumber's snake to break up the ice. However, for a more significant freeze, it's best to call a professional plumber, as they have the tools and expertise to safely and effectively thaw the pipes without causing further damage.