Which ingredient is not used in the creme caramel flan frappuccino?

The ingredient that is not used in the caramel flan frappuccino is frapp roast. The frapp roast is a coffee base typically used in most frappuccinos, giving them a coffee flavor. However, the caramel flan frappuccino is designed to showcase the sweetness and creaminess of caramel flan without the strong coffee component. Instead, it focuses on the rich flavors of caramel flan syrup combined with the cream base, ice, and any other flavors that may enhance the overall dessert-like experience.

The other components listed are essential to creating the texture and flavor of the drink: the cream base provides a smooth and creamy consistency, caramel flan syrup delivers the signature taste of the dessert, and ice is crucial for achieving the frappuccino's characteristic refreshing and icy texture.