fondling vs stroking

fondling

noun
  • The act of caressing; manifestation of tenderness. 

  • A pet or person who is fondled; someone who is much loved. 

stroking

noun
  • The act of making strokes. 

  • The act of laying small gathers in cloth in regular order. 

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