Haven't experienced snickerdoodle. The 3 flavors I've had rotated are the sea salt caramel, chocolate brownie and double fold vanilla. And definitely had a mix of ice cream on a plate with spoon, ice cream no plate with a spoon, and ice cream with expectation to use plastic shovel. The variation makes me think there are no instructions given to FAs on how to plate. Or that it's permissible to deviate. As another example I would say 70% of the time the nuts are served with the first drink service and 20% of the time on the dinner tray and 10% of the time no nuts served or as a mid-flight snack.