toad vs ugly duckling

toad

noun
  • An ugly person. 

  • An amphibian, a kind of frog (order Anura) with shorter hindlegs and a drier, wartier skin, many in family Bufonidae. 

  • A contemptible or unpleasant person. 

verb
  • To expel (a user) permanently from a MUD or similar system, so that their account is deleted. 

ugly duckling

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

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