drop in the bucket vs fol-de-rol

drop in the bucket

noun
  • Something of little importance, especially an inconsequential effort or action as compared to a huge problem. 

fol-de-rol

noun
  • Excessive efforts expended on a something trivial; much ado about nothing. 

  • A gaudy thing of little value; a trinket. 

  • Nonsense. 

intj
  • Nonsense word traditional to English ballads and madrigals. 

How often have the words drop in the bucket and fol-de-rol occurred in a corpus of books? (source: Google Ngram Viewer )