ash cake vs johnnycake

ash cake

noun
  • A bread (cake), usually specifically of cornmeal (thus, a cornbread), baked in hot ashes. 

johnnycake

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

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