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Fiskars sells splitting axes and mauls https://www.fiskars.com/en-us/building-and-fixing/products/sledge-hammers/fiskars-pro-isocore-wood-splitting-maul-8lb-36-751110-1004, I have the x11 splitting axe and it has a reasonably sized wedge head on it

Indeed, that's a proper maul that you have. That thing in OPs pic is a weird hybrid axe/maul thing that won't do either well. It'd probably shatter if you tried to hit it.