itty vs pygmy

itty

adj
  • Extremely small; itty-bitty. 

pygmy

adj
  • Like a pygmy; unusually short or small for its kind. 

  • Relating or belonging to the Pygmy people. 

noun
  • Any dwarfish person or thing. 

  • An insignificant person, at least in some respect. 

  • A member of a race of dwarfs. 

  • A member of one of various Ancient Equatorial African tribal peoples, notable for their very short stature. 

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