They can be, but most marshmallows are not kosher. This is because they are made with pork based gelatin, something which is not kosher. Kosher marshmallows use fish, bovine, or seaweed gelatin. It is important to look for a reliable kosher symbol on marshmallows.
Usually gelatin. Kosher marshmallows are made either with fish gelatin, or with Kolatin™ brand kosher gelatin, which is made from the bones of kosher slaughtered cows.
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.
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.
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.)
A lot of Nestle products are kosher, you would have to check the product packaging for a valid hechsher (kashrut certification).
sugar cane
The gelatin in Baker's Corner marshmallows is typically made from animal collagen, usually sourced from pigs or cows. So if you're looking for a vegetarian or vegan option, you might want to skip these bad boys. But hey, if you're cool with chowing down on some animal-derived gelatin, then dig in and enjoy those squishy treats!
Aldi
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.