If there is such thing as commodity fetishism, then there must be a term like "firepower" fetishism

No, that's what fetishizing individual commodities means. God given magical commodities!

Commodity fetishism is the fetishizing of the "commodity form", which is super unclear language, so I have to illustrate with an example.

You wake up every morning, head outside, and do a little dance. Your friend stays over one night and sees you do this. They say "Hey, you could turn that into a wonderful 1-person interpretive dance theater event. I bet a bunch of people would buy tickets!"

Or

You make yourself a lunch from the vegetables in your garden every week. One day your neighbor stops by and you offer them some of your meal. They say "This is so good you could package this up and put it on supermarket freezer aisles!"

Or

You are playing piano and your parent stops you and say "Why are you doing that? You're not pursuing a career as a musician, and you're not making any money by playing it. It's a waste of your time. Stop playing the piano and find something that you can make money with."

Or you are talking to your coworkers and they say "What did you do this weekend?" and you reply "I did some reading on carpentry and started learning how to build a chair" and they reply "Oh! Are you planning on selling chairs some day?" and when you say no they say "Then why are you learning carpentry?"

That's commodity fetishism.