birdling vs chook

birdling

noun
  • A little bird; birdie; a nestling (young bird, baby bird). 

chook

noun
  • A chicken, especially a hen. 

  • A cooked chicken; a chicken dressed for cooking. 

intj
  • A call made to chickens. 

  • An imitation of the call of a chicken. 

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