dogpile vs pig pile

dogpile

noun
  • A disorderly pile of people formed by jumping upon a victim. 

  • Any similarly disorderly pile of people or things. 

  • A pile of dogshit. 

verb
  • To pile on, to overwhelm in other senses. 

  • To jump into a dogpile. 

pig pile

noun
  • A disorderly pile of people formed by jumping upon a victim. 

verb
  • To jump into such a pile. 

  • To cause a group of people to lie in a pile upon another, originally as a punishment to the victim on the bottom. 

  • To act similarly with regard to residential density: to live or cause to live in high-density settlements. 

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