Yeah I was just listening to a reading and the reader stressed "Valiant" and I'm like, in what way, exactly. Awesome, clever, strong, swift, charming, funny, all fine. But at the point where Feanor torches the boats, Fingon has only had one real chance to be valiant.
Some event was invented in Season 2 to earn the name... I dunno what. Maybe you already knew that though.