knackwurst vs pigs in a blanket

knackwurst

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

pigs in a blanket

noun
  • a dish of ground pork and/or beef cooked in cabbages 

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