Isn’t this practically the plot of The Nightmare Before Christmas?
P.S. I know it’s not, but it could be the plot of a gritty reboot. A bunch of Halloween mascots are fed up with how Christmas is overtaking all of fall so they declare “War on Christmas” I’d watch it. Unfortunately I imagine this would be like a Seth Rogan and James Franco movie a la Sausage Party but hey I’d still watch it
It’s hard to call it war when the people being killed don’t fight back, I suppose