An airfoil includes first and second endwalls and an airfoil section having a dual airfoil profile. The airfoil section includes a double wall that has an outer wall that defines a primary leading end of the dual airfoil profile and an inner wall spaced from the outer wall. The outer wall is trapped between the first and second endwalls in mortise and tenon joints, and the inner wall defines a secondary leading end of the dual airfoil profile.