salmonberry vs thimbleberry

salmonberry

noun
  • The fruit from this bush, similar in appearance and texture to the blackberry and raspberry. 

  • A bush, Rubus spectabilis, found on the Pacific coast of North America. 

thimbleberry

noun
  • The fruit of the above plant. 

  • Rubus parviflorus, a species of Rubus, native to western and northern North America, from Alaska east to Ontario and Minnesota, and south to northern Mexico. 

  • The black raspberry, Rubus occidentalis. 

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