The Yeti are a number of similar fictional hidden races

Hidden Races (Marvel Comics)

The Earth of Marvel Comics' main continuity has contained a number of fictional hidden native humanoid races. A list of these includes:*The Alpha Primitives *Atlanteans*Bird-People...

 in the Marvel Universe

Marvel Universe

The Marvel Universe is the shared fictional universe where most comic book titles and other media published by Marvel Entertainment take place, including those featuring Marvel's most familiar characters, such as Spider-Man, the Hulk, the X-Men, and the Avengers.The Marvel Universe is further...

.

Yeti are fur-covered humanoid beings living in the Himalaya Mountains and familiarly known as "Abominable Snowmen." There are three known varieties of Yeti.

The first, the so-called "Cold People," were highly intelligent and had made advanced scientific developments. They were transformed into normal human beings.

A far more primitive race of Yeti with human intelligence first appeared in Man-Thing

Man-Thing

The Man-Thing is a fictional character, a monster in publications from Marvel Comics. Created by writers Stan Lee, Roy Thomas, and Gerry Conway and artist Gray Morrow, the character first appeared in Savage Tales #1 , and went on to be featured in various titles and in his own series, including...

vol.2, #2, but was destroyed.

An example of a third race of Yeti was encountered by Shang-Chi

Shang-Chi

Shang-Chi is a Marvel Comics character, often called the "Master of Kung Fu". He was created by writer Steve Englehart and artist Jim Starlin....

, and first appeared in Master of Kung Fu #124.