From chat gpt:

Beef tongue is considered an organ meat, as it is a muscular organ rather than skeletal muscle. Organ meats, in general, are sometimes referred to as “offal.” Offal encompasses the internal organs and entrails of a butchered animal, which includes organs like the liver, kidneys, heart, brain, and, of course, the tongue. While skeletal muscles are typically referred to as “flesh meat,” organs fall under the category of offal.