A shorter barrel length means portable guns would be less affective as well. They could use piercing melee weapons like swords but they’d have to be more strategic where they strike. Of course with sufficient tech or magic these limitations could be overcome.
You should look into Pathfinder 2e! They have all sorts of small ancestries in the core books like Tripkee (froglike), Ratfolk, Kobold, Goblin, Leshy (nature spirit), and more. The best part is that even the most silly character builds will be interesting and fun to play because of how leveling works.
TTRPGs are too social for me XD