Halflings started off as Hobbits in
0e and stayed there awhile.
B/X and
3e made them slimmer.
A few take offs of the standard were things like the Fineous Fingers halfling mafia from early Dragon comics which you can see thematically in other contexts like the Benevolent Society for the Advancement of Halflings in
Freeport.
2e Dark Sun had cannibal halflings with lifeshaping magic and a background of world domination.
3e added dinosaur riding halflings in
Eberron.
Pathfinder had halflings as tagged onto human cultures but best known for being enslaved in devil worshipping Cheliax.
4e went with a sort of river gypsy nomad theme.