black pudding vs frankfurt

black pudding

noun
  • A blood sausage made from pork blood, a high proportion of cereal (oats or barley), and spices; eaten at breakfast and combined in starters and salads. 

frankfurt

noun
  • A frankfurter; a hot dog sausage. 

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