The highest population of mobs that can be farmed for Stormscale would be the Squallhunters in Stormheim. They are dragon looking creatures and they come in three different sizes. They are located at the north of the map. have a look at the map for the location to farm Stormscale.
The Dragonkin you are looking for are:
- Adult Squallhunter
- Juvenile Squallhunter
- Rampaging Squallhunter
Hope this helped you with where to farm Stormscale in wow. Happy farming!