bushwhacker vs trigger person

bushwhacker

noun
  • One who travels through the woods, off the designated path. 

  • A person who lives in the bush, especially as a fugitive; a person who clears woods and bush country. 

  • A small, soft-floored inflatable boat (designed for use by one or two people). 

  • A guerrilla (of either side) during the American Civil War. 

trigger person

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