I don't have a tool that would drill or punch largish holes in the trowels and so I would not be able to do that. But . . . I think a trowel could be used as a snow anchor without holes, especially the Big Dig.
In the East, where my snow camping is generally done in woodlands, I tend to create snow anchors out of sticks I can easily find on downed wood. Above tree line in the East or West, assume you would need multiple snow anchors for a shelter, so not sure how important this trowel functionality would be.