I've seen mods that replace the werewolf with things such as the Xenomorph from Alien, but there does not seem to be one that replaces the werewolf with a Primal Zerg from Starcraft.
There are various different types of Primal zerg, of course, but here are a couple of images I found of the types that I think *could* fit:
Primal zerg from Cinematic: (https://i.pinimg.com/originals/2f/aa/8a/2faa8aadaf5430ad8c543b122b755599.jpg)
Dehaka: (https://vignette.wikia.nocookie.net/starcraft/images/8/8b/Dehaka_SC2-LotV_Mammoth_Rend1.jpg/revision/latest/scale-to-width-down/350?cb=20170902033958) or (https://vignette.wikia.nocookie.net/vsbattles/images/b/b2/Dehaka.png/revision/latest?cb=20170129155456)
I know it would probably fit a bit more with Fallout, seeing as it's from Starcraft, but Skyrim has werewolves, Fallout doesn't.
Thank you for taking the time to read this.