sugar-plum vs sugarpie

sugar-plum

noun
  • Term of endearment: sweetheart, darling. 

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

sugarpie

noun
  • A term of endearment; honey, sweetie, darling. 

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