dragon lizard vs flying dragon

dragon lizard

noun
  • A member of the Agamidae family of iguanian lizards. 

flying dragon

noun
  • Any lizard in the genus Draco. 

  • Draco volans, a gliding lizard endemic to Southeast Asia. 

  • Used other than figuratively or idiomatically: see flying, dragon. 

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