HOMESTEADER
squatter, homesteader, nester
(noun) someone who settles lawfully on government land with the intent to acquire title to it
Source: WordNet® 3.1
Etymology
Noun
homesteader (plural homesteaders)
A pioneer who goes and settles on a homestead.
Source: Wiktionary
Home"stead*er, n.
Definition: One who has entered upon a portion of the public land with the
purpose of acquiring ownership of it under provisions of the
homestead law, so called; one who has acquired a homestead in this
manner. [Local, U.S.]
Source: Webster’s Unabridged Dictionary 1913 Edition