filch vs snarf

filch

verb
  • To illegally take possession of (something, especially items of low value); to pilfer, to steal. 

noun
  • Something which has been filched or stolen. 

  • An act of filching; larceny, theft. 

snarf

verb
  • To take something by dubious means, but without the connotations of stealing; to take something without regard to etiquette. 

  • To eat or consume greedily. 

  • To slurp (computing slang sense); to load in entirety; to copy as a whole. 

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