puppy love vs sentiment

puppy love

noun
  • A childish or youthful infatuation with another person. 

sentiment

noun
  • Feelings, especially tender feelings, as apart from reason or judgment, or of a weak or foolish kind. 

  • A general thought, feeling, or sense. 

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