leaf litter vs stover

leaf litter

noun
  • Dead plant material, such as fallen leaves, bark, and twigs, that has fallen to the ground and may be used by animals as habitat or for nest-building, eventually decomposing and releasing nutrients into the soil. 

stover

noun
  • Stalks and leaves, not including grain, of certain forages 

  • Fodder for cattle, especially straw or coarse hay. 

  • Coordinate terms: straw, shaw, trash 

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