I am bumping this post because I want to point out that this NPC advertising Grumpus Tale is an actual costume now. So this is even more likely to cause more confusion on what costume you’ll get for purchasing the Grumpus Tale Marketplace map.
At this point The Hive should change the NPC advertising Grumpus Tale to the Ice Golem costume, otherwise you may disappoint people in the future who will assume that Grumpus is the costume they will get for purchasing the map.
I know that the winter themed hub will be gone in early January and so will this NPC, but this should be taken into consideration for next Xmas.