I remember the first few days I played FFXI I noticed I had this by my name:
What did it mean? I had no idea. So after some research I found out it's basically a thing in japan where when you're a new driver you're required to display it for at least a year on your car to warn others to look out for you and give you some extra consideration. Adapted to the game it meant that the person playing that character has just started and could probably use some help. This is what the sprout is to me. "Hey I'm new! give me some leeway and expect some mistakes!".
The crown however is something you should wear when you've GOT the knowledge and GOT the patience. The sprout is a warning, the crown should be like a PHD on a business card: "I'm experienced, I'm qualified".