frappe vs thickshake

frappe

noun
  • A thick milkshake containing ice cream. 

  • A liqueur or cocktail served on shaved ice. 

  • An iced, sweetened, beaten coffee drink, associated with Greek cuisine. 

thickshake

noun
  • A beverage consisting of milk and ice cream mixed together, often with other flavorings as well. 

  • An imitation milkshake (in locales where "milkshake" refers to the drink specified above), often containing no milk. 

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