Nutcrackers became a Christmas symbol because of Tchaikovsky's ballet. I never thought of them as a possible Halloween thing, but why not? People crack nuts in autumn, too, even more so because it's harvest season. Besides, we Halloween fans take inspiration from anywhere! Redditor GingerbreadDisco posted her collection of Halloween nutcrackers just this week. These 15-inch nutcrackers came from TJ Maxx. The only one I can find at their online store right now is Frankenstein, but you should check with your local store. I hear they also have a vampire model.
You'll also find Halloween-themed nutcrackers at Joann, Walmart, and specialty shops, but if you want them all to match in height and aesthetic, you'll want to stick with one vendor or buy them all at once.