Companies using FF?

Are there any animation or film companies using Photoshop? I'm wondering if use is widespread enough that as my skill increases I can add that to my LinkedIn resume as a skill.

Photoshop is pretty much used everywhere and everybody will have some adobe software in their studio computer anyway.

Typically companies don't exactly say what they use. The obvious ones are obvious but the in-house tools, python scripts, countless vfx utilities, and many others rarely get mentioned unless the company that develops them asks for testimonials or specific opinions. There can be "trade secrets" heh.

I can safely say that my friends across a variety of studios have used FilterForge sometime in the past to do something to their work. They mostly would be making bitmap texture tools and otherwise. But I don't know which studios specifically use it in their workflow. Pretty sure there are a couple.

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Are there any animation or film companies

There really are. I would prefer not to disclose specific names but a Japanese motion picture company of Californian origin have purchased several dozen copies of FF.

Also, many gamedev studios, including the most prominent ones, use FF for making textures.