bonefolder vs lowboy

bonefolder

noun
  • A dull-edged hand tool used to fold and crease material in crafts. 

lowboy

noun
  • A low chest of drawers. 

  • A semi-trailer designed for hauling vehicles and other mobile equipment, with two drops in deck height: one right after the gooseneck and one right before the wheels; so named because the trailer's main deck is situated close to the ground for easy loading and unloading of vehicles and equipment. 

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