Cave dweller
A cave dweller or caveman was a being inhabiting a cave, and was often associated with primitive cultures. 

On ancient Earth, troglodyte was a less-than-technical term for cave dwellers. The name of the Troglytes on Ardana was also derived from the term. ()

The 20th century Earth cartoon, Daffy Duck and the Dinosaur, featured a caveman named Casper, who lived in a cave with a welcome mat in front of the door. ()

Two decades after Dramia II was first hit by an Dramia II plague, the once civilized planet again had cave dwellers. ()

In 2365, upon studying an Iconian device recovered from Denius III, Donald Varley described his frustration at not understanding it by comparing himself to a caveman confronted with a tricorder. ()

In 2366, Jean-Luc Picard explained the differences between himself and the Mintakan Nuria by having her compare herself to her cave dwelling ancestors. ()

After being stranded on Hanon IV,  crewmembers speculated that its natives might be cave dwellers. ()

See also
 Neanderthal

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