Piddle vs Pool

Piddle

name
  • A brook in Worcestershire, England. 

  • A small river in Dorset, England. 

Pool

name
  • A civil parish in the Metropolitan Borough of Leeds, West Yorkshire, England, also known as Pool in Wharfedale. 

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