After 12 years, these guys still have not received a species profile or even names. So i took it upon myself to create some lore for them
Gruffhog: A stocky Stoker class dragon, gruffhogs are tough creatures that tend to confront any new vikings and dragons it meets. However if impressed, gruffhogs are loyal companions that protect any it considered to be a part of its herd. Even gruffhogs that were part of drago army were know to risk their lives to protect soldiers in the battlefield.
Thornbacks: sluggish for a Sharp class, these dragons usually prefer resting than participating in the usual energetic activities of other sharp dragons. Sleeping for most of the day, thornbacks like to conserve their energy just in case they need to make a quick escape or charge into battle. Relying on their spiky backs to ram into enemies with lethal force.
Turfslasher: Unlike the many rock eating dragons of the Boulder class, turfslasher prefer eating piles and piles of fresh soil. With the ability to find the richest deposit of dirt, farmers are wise to follow them as they can enjoy a bountiful harvest with whatever spot this dragon finds. And its not hard to work with this dragon because if their anything a turfslasher likes as much as dirt, its some fresh vegetables.
Dreadstalker: During the war, many vikings believed this dragon was a bad omen that brought plague to villages. Once one showed up, illness would usually break out with the dreadstalker being killed immediately, which only spread the sickness. But this former member of the fear class is completely misunderstood, it doesn't bring diseases rather its attracted to it. According to valka notes, these tracker class vulture dragons have a taste anything rotten, completely cleaning any given area that keeps the ecosystem clean.