frond vs haulm

frond

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

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

haulm

noun
  • An individual plant stem. 

  • The stems of various cultivated plants, left after harvesting the crop, which are used as animal food or litter, or for thatching. 

  • Part of a harness; a hame. 

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