murphy vs tatty

murphy

noun
  • An Irish or white potato. 

tatty

noun
  • A potato. 

  • A woven mat or screen hung at a door or window and kept wet to moisten and cool the air as it enters. 

adj
  • Tattered; dilapidated, distressed, worn-out, torn 

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