mezzotint vs prong

mezzotint

noun
  • A form of intaglio etching in which a metal plate is roughened evenly and then smoothed to bring out an image. 

  • An etching or print made using this method. 

verb
  • To make such etchings 

prong

noun
  • A thin, pointed, projecting part, as of an antler or a fork or similar tool. A tine. 

  • The penis. 

  • A branch; a fork. 

verb
  • To pierce or poke with, or as if with, a prong. 

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