stack-upon-the-kill vs stacks on the mill

stack-upon-the-kill

noun

  • A dogpile game played in Cheshire and other areas of Britain. 

stacks on the mill

noun

  • A children's dogpile game. 

  • Synonym of dogpile, especially in Australian football. 

How often have the words stack-upon-the-kill and stacks on the mill occurred in a corpus of books? (source: Google Ngram Viewer )