How widespread are snow goblins?

We do have snow goblins here in PA (also the Northwest)

However, we consider them goblins because they jump your car, not after they do so.

This is them before they jump your car.

I'll provide an answer from the Midwest.

We do not have a word for this (not that I am aware of).

It's not one word, but if I had to describe it to people around these parts, I would simply say "snow between the tire and wheel well."

Apparently, snow goblins have long been a perennial problem stretching to the very North Pole itself, which some have posited may be their ultimate origin. You can see them in full havocking mayhem in the top half of this familiar illustration:

That illustration was created by an eldritch enthnographer of great renown. In the cited source we learn that. . . .

Apparently, Father Christmas has been at war with the Goblins for centuries. In 1932, the North Polar Bear stumbles into one of their deserted underground caves, the walls covered with paintings, some by goblins, some by men. Soon, sensitive to the smell of Goblins, the North Polar Bear uncovers a system of tunnels that lead in to the kitchen of Father Christmas’s old house. Father Christmas thought the goblins were taken care of after the trouble they caused in 1453, but with evidence of at least one hundred years of activity, Father Christmas knows he must take action. He smokes the Goblins out into the hands of the Red Gnomes who chase them out of the land. The threat has passed, although Father Christmas believes “they will crop up again in a century or so.”

A century from when that was written would be 2032, so apparently they’ve cropped again even sooner than predicted. Indeed, I believe there was a major incursion of these boreal Goblins back around the time of the Second World War, when they were again driven back into their ice-caverns, there to brood and breed.

It does sound like you’re having a major irruptive event right now there where you are. Best of luck with that.