cheechako vs foreigner

cheechako

noun
  • Someone new to Alaska or the Yukon; originally, a gold rush newcomer. 

foreigner

noun
  • A private job run by an employee at a trade factory rather than going through the business. 

  • A person from a foreign country. 

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