Are there vegan marshmellows available?
Yes, from a company called Emes located in Lombard, IL, U.S.A. Phone: (708) 627-6204. The package lists gelatin, but it is not animal derived. Most “kosher gelatin” isn’t vegetarian (it’s either made from fish cartilage or supervised by a less strict rabbinic authority that permits regular gelatin (a recent issue of “Kashrus” has an article on kosher gelatin)), but Emes kosher gelatin is made from carrageenan (and you can often buy Emes “gelatin” separately).
