layer cake vs sandwich cake

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. 

sandwich cake

noun
  • A layer cake. 

  • A savory Swedish cake made from layers of bread with creamy fillings made from salmon, egg, vegetables, etc., served cold and sliced like a dessert cake. 

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