What type of bread is specifically noted for the chicken salad?

The chicken salad at Dunkin' is specifically noted for being served on a croissant. The croissant's buttery, flaky texture complements the ingredients of the chicken salad, enhancing the overall flavor and presentation. This type of bread is popular for sandwiches that include salads, as it adds a light and airy experience while providing a distinct taste that pairs well with the savory elements of the chicken salad.

The other types of bread listed, while they can be used for various sandwiches, do not have the same culinary pairing or traditional use with chicken salad in the context presented by Dunkin'. A baguette may be too crusty for this application, whole wheat bread offers a denser option that might not enhance the delicate nature of the salad, and white bread, while soft, lacks the unique texture and flavor profile that a croissant provides.