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You can be threatened or sued for pretty much anything - if they care, are bought by someone who cares (ie Disney) or in the future start caring then you might be sued. Whether it goes anywhere or whether you win is a different matter.

Trademarks are based on a class of product or thing however (see eg the goods and services listing on https://trademarks.justia.com/875/27/iron-87527652.html - one of a bunch of iron man trademarks), so if there's no confusion/it's not a category that they have trademarked, then your odds are better.

If you want legal advice, you should seek out a trademark attorney. In general, though, you'd be infringing if the company has the name registered for use in your industry.

You're making a product. You should probably talk to someone who knows about trademark law.

Maybe a lawyer?