A scavenger hunt is for finding whatever the hunt is about. So if I gave you a list of flowers and told you to find them around the city, that's a scavenger hunt. If you gave me a list of foods and told me to find a restaurant that serves each one, that's a scavenger hunt.

For frozen yogurt, it's a little more complicated than that. I know they're usually in spinning machines... a store would probably be the place to try it.