griddlecake vs johnnycake

griddlecake

noun
  • Any of various forms of small pancake made from a spoonful of batter cooked on a griddle 

johnnycake

noun
  • A dense, baked or fried flatbread made of cornmeal. 

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