Sand Trap Fluffs spawn in the sand traps of the Goof course. If you hit a Goof ball into a sand trap, several aggressive fluffs will spawn.
Sand Fluffs, located in Gold Beach, have a similar body color but have a starfish crest, while Sand Trap Fluffs have a golf ball crest. Sand Fluffs are also much stronger and have Quicksand abilities. (Now they have a Footspeed and a DoT debuff.)