Wynnter Fair Untradables?

Ok during the Wynnter Update I had been playing the mini-games at the fair, I had gotten a "Wynnter Fair Tree" and "Wynnter Fair Cookies" with some of the prize tokens.

Both those items are untradeable, so I was wondering what you can use them for?
I looked on the wiki but it didn't mention their uses..

Is there even a use for them or are they just for collecting?
If they are for collecting then why the untradeable tag?

 

Just collectibles. They're untradeable because they're unique items from a limited-time event.

 

Ok so they're like the Souvenir amulet, makes sense I guess..
Still they're quite nice to have for memories sake.