baby doll vs betty

baby doll

noun
  • A young attractive woman; sweetheart, darling. 

  • A style of women's nightdress. 

  • A child's doll designed to look like a baby. 

betty

noun
  • An attractive woman; a babe. 

  • A short bar used by thieves to wrench doors open; a jimmy. 

  • A baked dessert made with alternating layers of sweetened fruit and buttered bread crumbs. 

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