jo vs sweetling

jo

noun
  • Darling, sweetheart. 

  • The staff used in the Japanese martial art of jodo or jojutsu. 

sweetling

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

  • A small, sweet thing. 

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