Hmm. So there's at least two ways to jump? Interesting.
Maybe it's not so unlikely that no one ever tried jumping onto the snow monster via all available methods.
I think it was the ski ramp that was able to kill them.
Does anyone have a Windows box handy? If so, does the .exe still run on modern Windows? (https://ski.ihoc.net/ski32.zip)
Whoa, apparently the author recently recompiled the SkiFree exe with VS2019. So, they have access to the source code, and there's a modern version available...
... Welp. This sounds like the beginning of a new quest to unveil a childhood SkiFree mystery. I wonder if I can bribe them to quietly let me rifle through the source code looking for the snow monster logic.
Doesn't it seem kind of out of place that there wasn't any way to kill the snow monsters? Betcha there's at least one. And jumping is the only available mechanic, other than tricking it into running into a tree, Tasmanian-devil style.
And also jump by using one of the mouse buttons especially using the little snow hills, that will propel you forward.