Dambala is a troll loa. In Battle for Azeroth there is a follower ability called "Blessing of Dambala", granting an increased success chance against mounted troops and depicting a cobra snake.
In the RPG
This section contains information from the Warcraft RPG which is considered non-canon.
Dambala is the loa of serpents and treachery. He teaches shadow hunters to move swiftly and quietly by changing their shape into a serpent or snake.
Dambala is a reference to one of the most important of the Haitian loa, Damballa, the serpent spirit. He birthed the cosmos and is the creator of life.