flibbertigibbet vs ugly duckling

flibbertigibbet

noun
  • An offbeat, skittish person; especially said of a young woman. 

  • A flighty person; someone regarded as silly, irresponsible, or scatterbrained, especially someone who chatters or gossips. 

ugly duckling

noun
  • A young person who is ugly, but who is expected to become beautiful as they mature. 

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