cucumber vs folding money

cucumber

noun
  • A vine in the gourd family, Cucumis sativus. 

  • The edible fruit of this plant, having a green rind and crisp white flesh. 

  • A person who is calm and self-possessed. 

folding money

noun
  • Paper currency; cash in the form of printed banknotes. 

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