What baking product does IHOP feature that is often served with toppings?

The correct choice is pancake stacks, as they are one of the signature offerings of IHOP. Pancake stacks are typically characterized by multiple layers of fluffy pancakes that can be customized with a variety of toppings, such as syrup, fresh fruit, whipped cream, and more. This versatility not only caters to different tastes but also highlights the brand’s focus on breakfast items, especially pancakes, which are a central part of IHOP's identity.

Other options, like waffles, French toast, and crepes, are indeed part of IHOP's menu and can also be served with toppings. However, pancakes are particularly synonymous with the IHOP experience, making pancake stacks the definitive answer when considering what baking product is notably featured by the restaurant. These stacks are designed to be an appealing centerpiece to both their breakfast menu and the overall dining experience at IHOP.