Caddy vs Thing

Caddy

noun
  • A Cadillac car. 

Thing

noun
  • Nickname for the Volkswagen 181. 

  • Nickname or appellative for numerous "things", including fictional characters. 

  • A public assembly or judicial council in a Germanic country. 

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