liefling vs sugar-plum

liefling

noun
  • One held as lief or dear; a darling. 

sugar-plum

noun
  • Term of endearment: sweetheart, darling. 

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

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