can they be used for anything?
They're not something for "use" like lingots.
They are just a representation of how many skill levels you have gotten through.
you have 140 of something that looks like fire. what is that symbol and how do you increase it
You cook the crowns with them first.
(The crowns just tell you the amount of times you have leveled up your skills, while the fire is the amount of days in a row you have kept a Duolingo streak. I hope this helps.)
When you get a crown, you also get lingots. And you can obtain many, many valuable things with the lingots. I felt generous and gave you five of mine. Be careful not to spend them all in one place.
thank you. what valuable things can you do with the lingots? besides giving them away?