pocket change vs small fry

pocket change

noun
  • An insignificant amount of money. 

small fry

noun
  • One or more relatively small and insignificant persons or things of relatively little consequence, importance, or value. Synonyms: small potatoes, minnow, nobody, no one 

  • One or more small or immature fish. 

  • One or more children. 

How often have the words pocket change and small fry occurred in a corpus of books? (source: Google Ngram Viewer )