The Frozen Sea (Dragon Games Book #2) by Maddy Mara

Team Dragon is back! This time Luca, Yazmine and Zane have landed in the icy region of North Gelida. Here they must navigate giant frozen waves and outrun a hungry monster made of snow to return the second Thunder Egg to its frosty palace.
 
But Dartsmith, the evil leader of Imperia, is always lurking, determined to make sure the dragon prophecy won’t come true. He’ll do whatever it takes to win the Dragon Games—but Luca, Yazmine and Zane are determined to stop him!