frozen yogurt vs ice cream bar

frozen yogurt

noun
  • A frozen dessert made from yogurt or other dairy products, slightly tarter than ice cream and lower in fat. 

ice cream bar

noun
  • A frozen dessert on a stick or a candy bar that has ice cream in it. The coating is usually a thin layer of chocolate. 

How often have the words frozen yogurt and ice cream bar occurred in a corpus of books? (source: Google Ngram Viewer )