Yes, they are handy. I even have two I occasionally carry and use - at certain events.
But, as far as I have seen/heard, they do not have any historical documentation to back them up. They may be ... historically inspired ... but not based upon any original artifacts, paintings, or descriptions --- that I have seen or heard of so far.
The closest thing would be a Roasting Fork. They were designed to roast or warm up meat in your fireplace. They generally had two tines, a long handle, and two attached legs near the fork end - to hold it up when set next to the fire. The long handle balanced the meat on the other end, and rests on the ground or floor.
Separate individual roasting forks or skewers, yes. Just not a combination with a holder to stick in the ground. But they sure are handy.
So I personally seldom carry/use one. And it becomes a matter of personal choice if you wish to use one. Although, the have become ... accepted ... by many pretty strict groups and juried events. Accepted ...
Just my humble thoughts to share, and best used in conjunction with your own research.
Mikey - that grumpy ol' German blacksmith out in the Hinterlands