bannock vs sponge cake

bannock

noun
  • A biscuit bread made of wheat flour or cornmeal, fat, and sometimes baking powder, typically baked over a fire, wrapped around a stick or in a pan. 

  • An unleavened bread made with barley, wheat, or oatmeal. 

sponge cake

noun
  • A light, soft, baked dessert (commonly layered with cream and jam) that is typically made with flour, sugar, baking powder and eggs, and has a firm, yet well aerated structure, similar to that of a sea sponge. 

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