As for nuts, are you coconut-allergic too? Frozen whipped coconut milk is great, particularly flavored with cocoa.
How about flavored merangues? Egg whites, sugar, and a dash of cream of tartar for stabilization (or vinegar or nothing.) Then, add a dash of whatever you like: pumpkin pie spice, lemon, peppermint, or other flavor.
Pumpkin pie can totally be made without a crust. It is more like a custard. Ohhhh, but I really am not sure how to do this with no dairy.
Honestly, my sweet tooth lately is satisfied (sorta, I'm trying to convince myself) by Good Earth Original tea. LOVE IT!!! Add a splash of (insert choice milk here) and you have a creamy drink that takes time to consume (if you make it hot enough.)
Oh, final idea: freeze peeled bananas and dip them in some chocolate sauce. Delish!