squatter, homesteader, nester -- (someone who settles lawfully on government land with the intent to acquire title to it)
squatter -- (someone who settles on land without right or title)
Overview of adj squat
The adj squat has 2 senses
chunky, dumpy, low-set, squat, squatty, stumpy -- (short and thick; as e.g. having short legs and heavy musculature; "some people seem born to be square and chunky"; "a dumpy little dumpling of a woman"; "dachshunds are long lowset dogs with drooping ears"; "a little church with a squat tower"; "a squatty red smokestack"; "a stumpy ungainly figure")
squat, underslung -- (having a low center of gravity; built low to the ground)