These mischievous little critters are called Sockies. They're lost socks that became living creatures due to the magic of the Monsteria. They scurry around the play place stealing shoes to hide them. Thankfully they're pretty easy to find since the Sockies leave clues for the kids. And they find candy in their shoe when it's found!

That's the fun lore for the Mosnteria in reality they're creations of the storyteller. She made them for funsies one day when she saw all the socks kids left behind lol. So the lore about Sockies being made out of the socks kids leave behind is true but the "magic" that helped them become sentient was with the yarn from the storyteller's hair. They don't really have a name. Just called Sockies as a whole.