I’ve been calling them ne’er-do-wells lately, or sometimes layabouts.
rapscallions , knaves, scamps
knaves is a new one for me, thanks.
Scallywags
Milquetoast dandies.
Rabble-rousers
Malcontents
This one is going on the list.
Gadabouts
Ruffians, roustabouts
Scrimshankers! I always imagine that word in Mr Burns’ voice for some reason.
whippersnappers
Jackanapes
Toerags, ratbags, dustbin lids
An odd one, but my physics teacher would address us as ‘mollusc’ :D
It might not be quite what you’re looking for but some of these maybe.
https://arapahoelibraries.org/blogs/post/names-for-groups-of-animals/
Nothing a teenager loves more than learning something along the way
Vagabonds is a good one.
Blodgers (use Australian accent) Bloh-jah!
Point of order, OP asked for disused words, not frequently used words.