chicken feed vs drop in the sea

chicken feed

noun
  • A very small or insignificant quantity, especially of money. 

  • Food (usually grain) given to poultry. 

drop in the sea

noun
  • A very small or insignificant amount; something of little importance. 

How often have the words chicken feed and drop in the sea occurred in a corpus of books? (source: Google Ngram Viewer )