So, I just cracked open my copy of Tomb of Ice. While paging through the instruction manual, under "New Overlord Cards" I am instructed to add a copy of the "Lone Wendigo" card to the Overlord deck. However, I don't seem to have a copy of this card. I've counted and re-counted, and I do have 12 new Overlord cards from this set, as is spelled out in the Components section of the instruction manual.

Is the card count a misprint, or does the card not exist? o.O

there is no such card... they removed it before the expansion was released, but they did not remove it from the rulebook ...

There is a treachery card called "Prowling Wendigo" which spawns a single master wendigo, but that wouldn't be added to the deck by default. There's also a "Lone Medusa" spawn card (non-treachery.) There is no "Lone Wendigo" non-treachery spawn card, though.