Frankenstein vs freak of nature

Frankenstein

noun
  • A monster composed of body parts from various corpses attached and brought back to life by a mad scientist, typically strong, unable to speak clearly, and misunderstood. 

  • Synonym of mad scientist 

verb
  • To combine two or more similar elements into a consistent entity, or a cohesive idea. 

name
  • Various small towns in Germany. 

  • A surname from German. 

  • Victor Frankenstein or (sometimes proscribed) his monster. 

  • A former name of Ząbkowice Śląskie, a town in the Lower Silesian Voivodeship, Poland. 

freak of nature

noun
  • A monstrosity; a malformation; an abnormal organism. 

  • In the variety-show business, a person or an animal on exhibition as showing some strange deviation from nature, such as a bearded woman or an albino. 

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