Goblin and Hobgoblin
"While goblins and hobgoblins are slightly below average among the basic foot soldier units, they are quite numerous. They attack with spiked maces." RoE manual
Heroes with a specialty
Gretchin the Barbarian has goblins as a specialty, which increases the attack and defense skills of any goblins or hobgoblins for each level attained after 1st level and gives them a speed bonus of 1.
Tactics and info
They have pretty high attack for a level 1 unit, and are effective attackers when in great numbers. Their speed and growth helps too.
In the lore itself, the goblins (and hobgoblins) are aliens. Their blood is also green.
In one of the Armageddon's Blade teasers, the goblins were shown having bows in their hands. The reason for that is because the teaser animations were already done and were supposed to show a Forge goblin instead, which used pistols. However, due to fan backlash, they had to change the Forge creatures into "regular" creatures, and so the teaser became somewhat off-topic with ranged Goblins, a Minotaur and an Ogre guarding the so-called Varn 1904 Vault where the Armageddon's Blade was kept.
Their Forge equivalent was going to be called Grunt and its upgrade Foot Soldier, being a level 1 troop.