hard candy vs taffy

hard candy

noun
  • A candy prepared from one or more syrups boiled to a temperature of 160°C (320°F), thereafter becoming stiff and brittle at room temperature. 

taffy

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

  • Flattery. 

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