I mean, “marshmallow” has a more interesting derivation than most of the other words I’ve seen so far.
Althaea officinalis, the marsh mallow or marshmallow, is a species of flowering plant indigenous to Europe, Western Asia and North Africa, which is used in herbalism and as an ornamental plant. A confection made from the root since ancient Egyptian times evolved into today's marshmallow treat.
I find this really interesting especially considered I never gave much thought to how they were produced. I guess I assumed they were just sugar and some other common ingredients.
I don't think modern marshmellows contain any marsh mellow. They are usually just water, sugar and gelatine. They are easy to make at home, fun project if you have kids