The knife and axe collectors call this a broad head axe - you can buy them on that auction site that cannot be named or check out the knife collectors forum.
Dawson & Nye auction and appraisal firm
March 14-15, 2007 Furniture, Jewelry, and Fine and Decorative Arts Sale
Lot: 9 A BROAD HEAD AXE
Tie Hack Monument - Wyoming
Relief figure of a man holding a broad-head axe. To the lower left is a tree stump with a chopping axe embedded in it. Behind the man's legs, a cross-cut saw runs across the relief's width. On the upper left corner, a distant figure drives a small team of horses and in the upper right, another man is chopping a tie. The relief sits on a base with an inscribed plaque.
It seems that the term broad head axe is used interchangeably with broad axe.