jonnycake vs wheat

jonnycake

wheat

noun
  • A light brown colour, like that of wheat. 

  • Any of several cereal grains, of the genus Triticum, that yields flour as used in bakery. 

adj
  • Wheaten, of a light brown colour, like that of wheat. 

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