foreshadow vs foretoken

foreshadow

verb
  • To presage, or suggest something in advance. 

foretoken

verb
  • To betoken beforehand; prognosticate; foreshadow; give warning of; presage. 

noun
  • A prognostic; a premonitory sign; warning or presentiment. 

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