fruitcake vs nutburger

fruitcake

noun
  • A crazy or eccentric person. 

  • A cake containing dried fruits and, optionally, nuts, citrus peel and spice. 

nutburger

noun
  • A person considered crazy or eccentric. 

  • A patty made from or containing nuts; a burger containing such a patty. 

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