What could substitute vanilla ice cream in a root beer float?

Here are a few alternatives that you could use instead of vanilla ice cream to make a root beer float:

- Any other flavor of ice cream: While vanilla is a classic, there are many other delicious flavors that would also pair well with root beer, such as chocolate, coffee, or mint.

- Frozen yogurt: If you're looking for a healthier alternative, frozen yogurt can be a great substitute for ice cream. It's lower in fat and calories, but it still has a creamy texture and a sweet flavor.

- Sherbet: Sherbet is another good choice if you're looking for a lighter option. It's made with fruit juice and water, so it's lower in fat and calories than ice cream, and it has a tart and refreshing flavor.

- Gelato: Gelato is an Italian frozen dessert that's made with milk, sugar, and flavorings. It has a denser texture than ice cream and a lower fat content. Gelato would make a delicious and unique addition to a root beer float.

- Whipped cream: If you don't have any ice cream or other frozen dessert on hand, you could simply top your root beer with whipped cream. Whipped cream is a classic topping for many desserts, and it's a great way to add a little sweetness and creaminess to your root beer float.

Experiment and see which alternative you like the most.