piragua vs pirogue

piragua

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

pirogue

noun
  • A boat-shaped food that is stuffed with seafood. 

  • A canoe of shallow draft, made by hollowing a log. 

  • A small flat-bottom boat of shallow draft. 

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