lambkin vs sug

lambkin

noun
  • A term of endearment. 

  • A young lamb, a very young sheep. 

sug

noun
  • sugar; sweetheart (as a term of endearment) 

verb
  • To market a product or service by means of purported market research. 

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