Goblins, Hobgoblins, and Bugbears all share a common ancestry, and are often found in cohabitation. This results in a fairly homogeneous style between the various goblinoid races. The style could best be described as "viscous cleaver" rather than sword. Each weapon is unique, but they all tend to share common features - hooks, barbs, spikes, and a lack of any hand protection.
They also tend to be made of inferior iron and steel. For this reason it is rare to find anyone who would be willing to take them for sale or trade. The quality of the metal doesn't seem to have much impact on their lethality however! In fact the filth on the blades tends to make surviving a goblin wound chancy, even if the blow doesn't kill you.