footlong vs knackwurst

footlong

noun
  • A hot dog or submarine sandwich measuring a foot in length. 

adj
  • One foot long. 

knackwurst

noun
  • A highly seasoned scalded sausage made from beef, pork, and fatty tissue similar to a frankfurter, but shorter and thicker. 

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