There are also vegan marshmallows one can buy, without gelatin at all; the texture's a bit funny, but they mostly work. Sadly, they are in no way at all sugar-free. (I should think they're kosher by ingredients, unless there's something I'm missing, but I have no idea if they're kosher by certification.) Marshmallow fluff is also gelatin-free, and also easily obtained without going to a specialty store, which I as a vegetarian love; also not sugar-free, though, and it has egg whites which makes it non-vegan. I think the brand I've seen is kosher-certified, but I don't keep kosher so I don't remember by whom.
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