I would be surprised if they didn't, since all the icecream shops in the parks (or at least one dsignated one) has those offerings.
When I went the chef actually made me a small sundae with choclate syrup, peanut butter sauce and marshmallow. It was heaven. You could probably get a peanut butter and chocolate sauce sundae. The marhmallow sauce probably has eggs in it. Oh, you could do the strawberry sauce. MMMMMM
I really tried to get there this trip but we ended up having a big icecream day at B lizzard beach, so I settled for their giant snow cones instead.