pitchfork vs prong

pitchfork

noun
  • A tuning fork. 

  • An agricultural tool comprising a fork with sparse, light tines, attached to a long handle, used for pitching hay (especially loose hay) high up onto a stack (as on a wagon or haystack, or into a haymow). 

  • A similar fork with slightly more and heavier tines, used for mucking stalls and pitching soiled bedding into a wagon or manure spreader. 

  • Any fork used for farm labor, even a digging fork (but such usage is often considered ignorant by experienced farmers). 

verb
  • To toss or carry with a pitchfork. 

  • To throw suddenly. 

prong

noun
  • A branch; a fork. 

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

  • The penis. 

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

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