puppy love vs tenderness

puppy love

noun
  • A childish or youthful infatuation with another person. 

tenderness

noun
  • a tendency to express warm, compassionate feelings 

  • pain or discomfort when an affected area is touched 

  • concern for the feelings or welfare of others 

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