A question for the CGCC people: are there any common sorts of polyglot challenges that won't be in polyglot?

Depends on what you mean by won't. If you mean "likely to never be posted because it wouldn't be received well", I imagine there'd be some challenges that are tedious/require strict input/output

But that kind of challenge would probably not be well received regardless of tag

If you mean "won't be posted because it's too hard" we don't have a problem with hard

People on the site made Tetris using Game of Life after all

So difficulty doesn't exclude a question

Other than that, I don't see why a challenge wouldn't be using the polyglot tag if it's a polyglot challenge

When you have a challenge involving multiple languages doing the same (or different) things, you use the polyglot tag

What I am looking for is a way to find all the challenges that involve writing code that is simultaneously valid in multiple languages, and I'm wondering if there's a recurring well-known kind of that with its own name, so that questions in that style don't usually have polyglot on them too but only some other term

Essentially, I want to have a sentence in a paper of the form "On the Code Golf & Coding Challenges Stack Exchange, there are over NNN answers containing code simultaneously valid in multiple languages" and I don't want to be missing a big chunk of them

Polyglot tag is your best bet

Because any question doing that should be tagged as such

That should be of interest

and if it's not tagged as such that's just someone's personal error and not an excluded category

451 answers and counting

Also 451 languages and counting

Because it's a question where you add one language at a time

Great, thanks