frankfurter vs pigs in a blanket

frankfurter

noun
  • A moist sausage of soft, even texture and flavor, often made from mechanically recovered meat or meat slurry. 

pigs in a blanket

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

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