Crowns are one of Fall Guys' in-game currencies. They can be used to buy items from the in-game shop.
You can earn Crowns by winning shows, receive them as a reward for leveling up during a Season, external promotions (Prime Gaming), and surveys. Some shows might reward more or less than 1 for winning, depending on their difficulty (e.g.: Hard Mode, Squads Show).
On the 1st anniversary of Fall Guys: Ultimate Knockout (4 August 2021) a double Crown multiplier was activated, lasting one full day.
A 3D Crown, as seen in the Season level rewards tab.