apologue vs old saw

apologue

noun
  • A short story with a moral, often involving talking animals or objects; a fable. 

  • The use of fable to persuade the audience. 

old saw

noun
  • A cliché, saying, or overused expression; especially a proverb or maxim. 

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