fank vs stockyard

fank

noun
  • A pen for enclosing sheep, mainly in the Scottish Highlands. 

stockyard

noun
  • An enclosed yard, with pens, sheds etc. or stables, where livestock is kept temporarily before being slaughtered, treated, sold, or shipped etc. 

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