What is the common garnish for a majority of coffee cocktails listed?

Whipped cream is the common garnish for a majority of coffee cocktails because it complements the rich and robust flavors of coffee while adding a creamy texture. This garnish is particularly popular in cocktails like Irish coffee or coffee-based desserts, where the cream not only enhances the visual appeal but also adds a delightful sweetness and velvety mouthfeel. It creates a contrast with the bitterness of the coffee, making the drink more balanced and enjoyable.

In contrast, other garnishes like chocolate shavings, while also occasionally used, are less universal and often specific to certain variations of coffee drinks. Pineapple wedges are typically associated with tropical cocktails and do not have a place in most coffee beverages. Cherries are more commonly found in desserts or certain classic cocktails but are not a staple in coffee cocktails. Thus, whipped cream stands out as the quintessential garnish for this category of drinks.