It's an iced cappuccino.
Tim Hortons describes it thusly;
"The Tim Hortons Original Iced Capp is a Canadian classic made with a blend of coffee, cream, and ice. It offers a smooth, creamy, and refreshing taste enjoyed throughout the year. Whether served in summer or any season, it remains one of Tim Hortons most popular beverages."
Source:
That's Teela, man-at-arms daughter. So no blood relation.