The answer to 'why is my toilet frozen' is that the water in the toilet bowl and tank has frozen due to extremely cold temperatures. This can happen when the temperature inside your home drops below freezing, causing the water in the toilet system to freeze and expand, which can damage the toilet and cause it to stop working properly.
Some common symptoms of a frozen toilet include the toilet bowl and tank being completely frozen, the toilet not flushing or draining, and the water level in the bowl being abnormally high or low. If you suspect your toilet is frozen, it's important to act quickly to prevent further damage.