What is the real name of mount Tehama?

The real name of Mount Tehama is "Mount Lassen." Mount Tehama is an older volcanic structure that is part of the Lassen Volcanic National Park in California. It is often referred to by its earlier name, but the iconic peak associated with the park is Lassen Peak, which erupted in the early 20th century. The term "Mount Tehama" is sometimes used to describe the larger volcanic complex rather than a single peak.