dulce de leche vs taffy

dulce de leche

noun
  • A South American sweet spread made from sugar and boiled milk. 

taffy

noun
  • A soft, chewy candy made from boiled sugar, molasses, or corn syrup and butter. 

  • Flattery. 

How often have the words dulce de leche and taffy occurred in a corpus of books? (source: Google Ngram Viewer )