cobber vs sugar-plum

cobber

noun
  • A sweet consisting of a small block of hard caramel covered in chocolate. 

  • A pal, buddy, mate, friend; often used in direct address by one male to another. 

sugar-plum

noun
  • A round or oval sweet/piece of candy made of boiled sugar. 

  • Term of endearment: sweetheart, darling. 

How often have the words cobber and sugar-plum occurred in a corpus of books? (source: Google Ngram Viewer )