prank vs spoonerism

prank

noun
  • A practical joke or mischievous trick. 

verb
  • To make an ostentatious show. 

  • To perform a practical joke on; to trick. 

  • To call someone's phone and promptly hang up 

spoonerism

noun
  • A play on words on a phrase in which the initial (usually consonantal) sounds of two or more of the main words are transposed. 

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