Based off of your comment that they had an Icelandic-sounding name, I looked at the list of D&D book authors, and picked Thorarinn Gunnarsson, and started searching on the titles. I'm pretty sure you're looking for the Dragonlord Chronicles.
Dragonlord of Mystara
As dragons roam the lands that will become Glantri, leaving havoc, destruction, and death in their wake, an unpromising young man, a female sword-fighter, her dwarven sidekick, and a ne'er-do-well storyteller and prophet set out to defend their world.
Dragonking of Mystara
Establishing a shaky peace with the dragons, Dragonlord Thelvyn Fox Eyes is distraught when they attempt to use him as a pawn and weapon against their enemies in a new plot for power, which he fears will spark another war.
Dragonmage of Mystara
In the third episode, Thelvyn is a full-fledged dragon who has learned everything necessary to perform his main task. First he must find the stolen Dragon Necklace. In doing so, he finds an enemy that threatens his entire world. When he regains the Dragon Kings power badge, he becomes the Dragon King and begins to organize the defense of the country. It is high time, since the enemy has already launched an attack.
Incidentally, by his own confession, Thorarinn's claim of being Norwegian was entirely false, a backstory he created in early days of the Internet when people could be whoever they wanted to be, and which he furthered because it sold well.