Some HiveWing soldiers have been seen carrying "long, needle-like lances".
Pronged spears are used by NightWings to push the enemies back into the lava when the enemies wanted to escape from the lava.
Peril is the only dragon who uses firescales to fight that is alive today. Not only can she attack with them, but they can be used defensively, because they make her immune to fire or heat-based attacks, metal weapons melt on contact with her, and the heat from her scales charbroils most venoms to impotency in seconds, but acids like RainWing venom might still harm her.
Some of them wield swords, like the ones who killed Queen Oasis.
Spears are used by scavengers too.
They also use their hands if they don't have a weapon (i.e. slapping, flailing).
In Winter Turning, a fortified town of scavengers made a catapult-type weapon that launched a flaming spear. It is possible that this was a ballista but this has not been confirmed.