Identify this Christmastime cartoon

[Walloon]

Memories of a British viewer:

It’s from the 1980s or early 90s, and is in 2D cartoons. Not particularly high-budget. The story is hazy in my memory, but it involves some kids who live on a snowy mountain, I think with Santa. But there are also horrible abominable snow monsters who live in the forests of the mountain. They are big and white with tiny beady eyes hidden by a really long shaggy fringe. The children are warned to stay away from these monsters, but for some reason they end up in the woods. I think they’re either rescuing someone or looking for a Christmas tree, it’s so hard to remember so far back! My new-found friend in the US reminded me of a bit in which the children leave food out for a rabbit which is being chased by a fox, and another moment when a reindeer kicks the abominable snow monster’s bottom and leaves a hoof print, which the snow monster sulks off to show his friends.
Another moment I remember is the children going ice-skating. They’re all wearing puffy bomber jackets and hats and scarves and mittens. One of the kids is quite chubby. I think, but am not certain, that they have a dog too.
At the end of the movie/short, the children are running down the mountain away from the monsters, and the villagers scare them away. They then make a wooden sign with a cartoon of the monster’s face on it with either a line through it or some other way of saying they’re not allowed. I’m pretty sure there’s then a moment where one of the kids alters the picture somehow, like making it squint or giving it bigger teeth or something, and everyone laughs. That’s another uncertain memory though. Sigh

From another viewer:

I just remember the older elf going to round up the reindeer and them getting caught in a snow storm or the reindeer was stuck or something and the kids went out to find them.

Santa was at the end because it seems like the dog went back to get him to tell him the kids were in trouble or something (that part is really not clear at all)

Ruled out: The Christmas Raccoons (1980).