frontiersman vs incomer

frontiersman

noun
  • A person who lives on the borders of a country, or in a wild and undeveloped area on the fringes of civilization. 

incomer

noun
  • An outsider who moves to a community or a place; (used by those who consider themselves to be its original inhabitants). 

  • One who comes in. 

How often have the words frontiersman and incomer occurred in a corpus of books? (source: Google Ngram Viewer )