How about Nittany Lions for 'mountain lions?' That is Penn State's mascot and they are definitely FBS (Big Ten Conference). Nittany is one of the two mountains that State College is located next to, so that's where the name comes from.
But that’s not the real name of the animal. A “Nittany” lion is just a made-up term for an eastern mountain lion, a subspecies (probably maybe) of mountain lions out West.
As someone who has lived their entire life in Texas and the wife of a fighting farmer. I have to have to call out your definition for what someone from College Station/Las Cruces etc. is. I think "Slang for someone who farms or ranches" would be better. Your definition describes the institution which would be an "Ag" or "Ag School".
Not so sure you can count that, there are many animals considered herds. Marshall just uses buffaloes as their mascot. But the name could reference to any animal that form herds. Examples; elephants, horses, sheep etc.