They were originally cloud giants according to the DDB entry. The cloud giant goliath ability is a teleport, which fits nicely.Per Bigby's, Death Giants are Shadowfell influenced Storm Giants, so the Arprm Goliath probably works fine for it.
"I bid thee welcome to Hasbro's Feywild Experience, please partake in our family friendly frolics. Remember, the Feywild is a alien place so please keep your children close at all times or my darling Puck may mistake them for a tasty morsel."
GENERATED PROMPT: A digital art piece of an animatronic character, Queen Tatiana of the Summer Court. She's adorned in a regal gown with predominant colors of emerald green and gold, accented with white. Her pose is dignified and poised, standing straight with a gentle smile, conveying her regal authority. The background is an enchanted forest clearing that complements her stature, with sunlight filtering through the lush canopy above. The greens of the forest are a myriad of shades, creating a tapestry that harmonizes with Tatiana's attire. Golden light beams add a magical ambiance, casting soft highlights and shadows across the scene. Drawn with digital rendering techniques, emphasizing metallic textures and reflective surfaces to give life to the animatronic features.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.