You can use this to skin the appearance of a Hammer on your pickaxe and sword! has a fearsome look.
cheat gfi ExtinctionHammer 1 0 0
or
cheat giveitem "Blueprint'/Game/Mods/2547261052/ExtReworks/ItemsRW/Tomahawk/PrimalItemSkin_ExtinctionHammer.PrimalItemSkin_ExtinctionHammer'" 1 0 0