cream slice vs mille-feuille

cream slice

noun
  • A wooden knife with a long thin blade, used in handling cream or ice cream. 

  • A vanilla slice. 

mille-feuille

noun
  • A type of pastry made of several layers of puff pastry usually filled with cream or custard, and topped with icing or sugar. 

How often have the words cream slice and mille-feuille occurred in a corpus of books? (source: Google Ngram Viewer )