galette vs layer cake

galette

noun
  • A type of flat, round cake from France. 

layer cake

noun
  • A cake consisting of multiple stacked sheets of cake, held together by frosting or jam, etc. 

  • A type of layering of materials, used in some nuclear bombs. 

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