grampop vs papaw

grampop

noun
  • grandfather 

papaw

noun
  • A father. 

  • A tree, Carica papaya, of tropical America, belonging to the order Brassicales, and producing dull orange-colored, melon-shaped fruit. 

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