frond vs leafling

frond

noun
  • The leaf of a fern, especially a compound leaf. 

  • Any fern-like leaf or other object resembling a fern leaf. 

leafling

noun
  • A small, tiny, miniature, or immature leaf; a leaflet. 

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