cronk vs keel over

cronk

verb
  • To honk like a goose. 

noun
  • A hill or barrow. 

  • The honking sound of a goose. 

keel over

verb
  • To collapse in a faint; to black out, to swoon. 

  • To die. 

  • Of a vessel: to roll so far on its side that it cannot recover; to capsize or turn turtle. 

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