Shover:
A goblin not taking blows can shove either an orc or his opponent from behind. If succesful, the two collide, causing each a round of lag and an opportunity for savage feeding to fire.

These could be edges or passive skills

Escape accomplice:
On a failed fallback by a grouped orc the goblin seizes takes advantage of the agressor's distraction to deliver an attack. This is an unpredictable skill that can deal damage, apply lag or small maladictions. An optional edge gives this skill the chance to make an otherwise failed fallback work, with the goblin in front (essentially a rescue on failed fallback)

Slavemaster's helper:
The goblin help an orc with its attempts enslave other creatures. This increases the maximum level of mob the orc can enslave, and reduces the opportunities for the slave to escape.

Spinebroken sadness
Goblins are known for demoralizing a spinebroken foe with taunts, posturing and doing gross things.