The Thorn pickaxe is an Uncommon Fortnite pickaxe. Thorn was available via the Item Shop for 500 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite Thorn Skin Details
Every axe has its thorn.
Fortnite Thorn Skin PNG Images
Here is the PNG images of Thorn below!