coracle vs piragua

coracle

noun
  • A small circular or oblong boat made of wickerwork and made watertight with hides or pitch, propelled and steered with a single paddle and light enough to be carried on a person's back. 

piragua

noun
  • A Puerto Rican frozen dessert, shaped like a pyramid, made of shaved ice and covered with fruit-flavored syrup. 

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