Sharpclaw was a dragon that lived during the Age of Fire.
He was a dragon, that lived in the Isle of Ice on the time of the Dragon-riders. He was part of the "fighting stock", being a castrated male dragon.
He was met by AuRon, who found out that Sharpclaw wasn't of very bright mind.
He didn't take active part in the Insurrection on the Isle of Ice, and probably remained close to the Isle as the others for some time with the former fighting stock dragons.
It's unknown if he was the dragon chosen by Epinonia or Alhala as their mate and as adoptive father for clutches sired by Starlight.