cultch vs leaf litter

cultch

noun
  • Rubbish; debris; refuse. 

  • Empty oyster shells and other substances laid down on oyster grounds to furnish points for the attachment of the spawn of the oyster. 

  • Young or seed oysters together with the shells and other objects to which they are usually attached. 

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. 

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