All vegan marshmallows - which contain no animal products and as such are parve - are kosher so long as they are kosher certified. The majority of kosher marshmallows on the market are made from fish gelatin which are also parve. Please see the related link for some brands of kosher marshmallows.
most marshmallows contain gelatin, which is made from pig bone, a pig is a non kosher animal gelatin made from it is considered to not be kosher.
Most of the kosher stores sell kosher marshmallows, such as Elyon, and also in areas with very large Jewish populations there are chain supermarkets that have huge kosher sections, and they will be in that section. But there are no ordinary non-kosher stores, or ordinary supermarkets with only small kosher sections, that sell this. Ordinary marshmallows are all treif, because of the gelatin.
The solid marshmallows have an animal-based gelatin, although the exact varietal is not identified. Bakers marshmallow crème on the other hand uses a non-animal based gelatin.
No. Almost nothing with marshmallows is kosher, due to the gelatin. Packages of kosher marshmallows are an exception to the rule, of course, so it's entirely reasonable to add your own (kosher) marshmallows to kosher hot chocolate.
There does not seem to be any brand of marshmallows with that name.
sugar cane
Kosher cookies are cookies that have been made with kosher ingredients. For example, no gelatin from animal sources (so marshmallows must be kosher, which are made with fish or seaweed-based gelatin.)
Aldi
A lot of Nestle products are kosher, you would have to check the product packaging for a valid hechsher (kashrut certification).
Yes they do. All General Mills cereals with marshmallows in them have pork.
Yes it is Kosher, blessed by a "Kashrut" or Koshering Rabbi. There is a sign on the jar that indicates it is Kosher for use with milk and meat. Basically what the person above me is trying to say is that yes it is but honestly don't trust everything you read. Just because it says that it is Kosher doesn't mean that we should eat it. You don't know what other chemical substances the makers put in it or (if you're Muslim) did they say BISMILLAH while making it.