Sorry, I thought the joke was implicit in your question, but the analog to "Lemmites" is "Piefites" which I think is just fine because say it out loud.
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You know what, piefites is a good neutral option!
If there's a joke in saying it out loud or something my sleepy brain isn't finding it
"Pie fights"
(Pie)feds
I like the idea of pieons, from peon (which I promise I don't mean derogatorily seeing as I'm not on piefed myself)
my dyslexia ass will just read “pigeons”
Crusties
I'm sure some of them are pieholes.
Piessants.
Piefkes
I'm also open to thoughts on "lemmites"! Its what I default to but I suppose it may be presumptuous for me to assume its what everyone uses, or wants to use :)
Pie peeps occurs to me as a potential option
Glowies /j
Pie lovers but we are lemmings.
Pieus
pie holes springs to mind
(to be clear i do not even remember what piefed is)
Piefuckers
That's only for those on US-based instances... i.e. American Piefuckers
phis
I have been using "Pie-heads", b/c we are just crazy enough to make that work! :-P

And the network of Lemmy + PieFed + Mbin (+ nodeBB + flarum) as the "Threadiverse", distinct from the wider Fediverse that also includes Mastodon, PixelFed, etc.
The fact that you name dropped NodeBB (a good example), Flarum (which has no working federation), but did not mention Discourse (which has only partially working federation and limited threadiverse support) gives me the warm and fuzzies 🤣
Piefederates
I got a better one if you understand french : pivert.
Good thread @cris_color@lemmy.world
Thanks! It seemed like it might be fun 😊
Hope you have a lovely day!
I don't really call them lemmites, haven't seen anybody else do so either, I think Lemmings has such a cool ring to it, very cute animals that travel in groups.
As for Piefed users if it's competing with something that cute then my vote is Piefolk.
Winchesters

Im not very fednocentric so I like the federation to refer to all. Possibly influenced by an ip I like.