Junk
Patient Gamers
A gaming sub free from the hype and oversaturation of current releases, catering to gamers who wait at least 12 months after release to play a game. Whether it's price, waiting for bugs/issues to be patched, DLC to be released, don't meet the system requirements, or just haven't had the time to keep up with the latest releases.
Junk items are what I usually call them. They might have some use, but they're mostly there to pass out the inventory.
For me, Trash items are a little worse, where they might do something bad (like stopping you from picking up other items because it takes up extra inventory spots or something).
I think this is the best answer. But actually there's at least 4 levels.
As said, Trash is actively in your way and blocks useful items until you deal with it. It sucks.
Scrap takes inventory space but you can refine it or sell it for something useful. So it's almost a currency, just with extra steps.
Junk is filler, you may have to scroll past it but it's just weightless fluff that only occupies space visually. You don't have to deal with it in a meaningful way.
And then Trinkets are all the little trophies and audio logs that get their own special screen you can just 100% ignore if you want.
You've got the new best answer!
Tchotchkes?
"Tchotchkes: A knickknack or trinket; a decorative item or souvenir of little value." <-- This isn't bad
Vendor trash
"Mathom" - A trinket or piece of bric-a-brac; a knick-knack, often used in regifting. Term coined by J.R.R. Tolkien
miscellanea?
Clutter, misc, trashure, junk, scrap.
One more word to add to the collection: cruft. Stuff that just builds up without you really noticing, mostly because it’s easier to collect everything than to filter it out of the good stuff.
Bad game design?
Dungeon Lint
I always called it "clutter" tho I don't know whether this is in any way official. De-cluttering an inventory means tossing the useless stuff out or packing it away.
guff.
Guffipedia was a gold mine.