taffy vs toffee

taffy

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

  • Flattery. 

toffee

noun
  • Any kind of sweets; candy. 

  • A small, individual piece of toffee. 

  • A type of confectionery made by boiling sugar (or treacle, etc) with butter or milk, then cooling the mixture so that it becomes hard. 

verb
  • To coat in toffee. 

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