frond vs stipe

frond

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

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

stipe

noun
  • The petiole of the frond of a fern or palm 

  • The trunk of a tree. 

  • The stem of a mushroom, kelp, etc. 

  • The caudicle within the pollinarium of an orchid flower 

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