sugar beet vs sweetling

sugar beet

noun
  • darling; sweetheart 

  • A type of beet whose root contains a high concentration of sucrose. 

sweetling

noun
  • Darling; sometimes used as a term of endearment. 

  • A small, sweet thing. 

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