It's not just a 👑 but a 💰 !
They’re not real money, its just what we call coins/money in Denmark - we call them kroner (which literally means crowns) and they look like this:
Yes, they have little hearts on them ♥
CROWNS are the in-game currency you are awarded by playing matches, completing missions and special events!
You can use them in the shop to get cool new outfits !
You can see how many crowns you have on the right side of the screen, in the shop :
but you can also see how many you have when you pick up crowns in the overworld!