knackwurst vs saveloy

knackwurst

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

saveloy

noun
  • A seasoned and smoked pork sausage, normally purchased ready-cooked. 

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