I'm A Banana
Potassium-Rich
It wouldn't be that bad even if there was just wolf and worg...But then to add the DIRE version and Winter (ok, at least, winter wolves had a distinct attack form). What was TSR thinking back then?
...there's definitely room in a game with over 3,000 monsters for a handful of different monsters that are vaguely lupine, since wolves are, after all, one of the most potent icons of the "evil widerness" that exist in the Western zeitgeist.
Regular wolves. Giant savage wolves. Wolves that herald eternal frost. Wolves that are smarter than you.
This is not to say that they necessarily all need to go in one book, or even that a worg is different enough from a wolf to merit a separate entry, just that three wolf monsters aren't any more inherently nonsensical than, say, three different types of elf, or three unique varieties of dragons.