An amusing question. I don't have any suggestions that I think are very good, but let me suggest some angles of attack.
The trick is to come up with something that would actually be a practical eating utensil, but that no one in the world uses in real life. (Or at least, that is uncommon enough that most readers would never have heard of it.)
I've read lot of stories that try to create an alternative society, and where I find myself thinking, "Oh come on, that is so wildly impractical, does NO ONE in this society think to try a better way?" Like you can write in a book that, say, the people in your society eat by handing meat from hooks in the ceiling, and then they run across the room and jump up to try to pull the food with their teeth, but ... I'd find that hard to believe.
Seems to me that there are basically five kinds of eating utensils people use:
Things to pick up food by stabbing it. Like modern Americans and Europeans use forks. In the Middle Ages, people would stab food with a knife to pick it up and carry it to their mouths.
Spoons and similar devices to scoop up food. Especially necessary for liquids as of course you can't pick liquids up with a stabbing item.
Grasping items, like chop sticks.
Cutting tools, like knives.
Breaking tools, like nutcrackers.
I think that basically covers the things that need to be done to eat. So what are other tools that could accomplish the same purpose?
Thoughts that occur to me:
Instead of breaking nuts crab legs with a plier-like device, you could smash them with a hammer.
To pick up food, use a scoop. Not much different from a spoon, but you could describe it to look much different.
Hey, here's an idea: How about a small mace? I mean, a heavy object maybe 6" long with spikes on the end? You could use it to hit nuts or shells to break them, and you could bang it against a largish piece of food so that the spikes stuck in it, and you could then pick up the food to put it in your mouth.
Tongs. People use large tongs to serve salad, etc, but you could have smaller tongs to pick up food and take it to your mouth.
A simple skewer, i.e. a long, skinny nail. Stick it into the food and pick it up.
Maybe instead of drinking from a cup, you could use a sponge. Dip the sponge in a bowl with the drink, then tilt your head back, hold the sponge over your mouth, and squeeze. I suspect this would be much inferior to a cup but maybe there's a way to make it more practical.
Small plates that fold in the middle -- either a hinge or made of a flexible material. Then you put some food on the plate, lift it up to your mouth, and pour it in. Seems very crude to me, but maybe that's just because it's so outlandish.
There's also the whole category of "edible utensils". Like a taco shell is edible, but it's also a handy device for holding all the ingredients that make up the taco. In the middle ages people ate from "trenchers" -- a small load of bread, cut open in the middle, and food stuffed in. Kind of an early sandwich.
This is a fun game. I like the question. Try to think of ways to solve a problem that are as different as those used by our society as you can think of, while still being practical enough to be plausible.
