doughnut hole vs munchkin

doughnut hole

munchkin

noun
  • A person of very short stature. 

  • A player who mainly concentrates on increasing their character's power and capabilities. 

  • A child. 

  • Synonym of donut hole (“ball-shaped pastry”) (genericization of the Dunkin trademark "Munchkin") 

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