shantyman vs timbergetter

shantyman

noun
  • A lumberjack 

  • The sailor who sings the main line of a sea shanty (the other sailors singing the responses or choruses) 

timbergetter

noun
  • A worker whose occupation is to harvest trees. 

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