lollipop vs rock candy

lollipop

noun
  • An item of confectionery consisting of a piece of candy/sweet attached to a stick. 

  • Something having the shape of a lollipop: a linear stem connected to a round body. 

rock candy

noun
  • A form of confectionery made by crystallizing sugar around a string. 

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