There are indications (mainly from the flag) that a few live in Gobbotopia.
Their appearance suggests that they are Goblinoids, which is confirmed in strip 1038.
A clan of bugbears is located near Serini's Gate and appear to be lead by Oona. All of the bugbear villagers appear to wear white fur headdresses with red markings, with Oona being the only one so far to take her headdress off. The tomb surrounding the gate, which the bugbears apparently hold in high importance as it provides them with both a safe refuge from the Dwarves and a place to hunt and tame monsters.