If you mean pea comb + rose comb, that a geneticist will call a walnut comb, then yes they definitely can be on both males and females.
Chanteclers are an example of a breed with walnut combs on both males and females.
If you mean a comb that looks like a walnut, and you do not care what genes...
Cushion and Strawberry are types of walnut comb. By that I mean that pages about genetics calls them walnut comb because they have both the pea comb gene and the rose comb gene. The people writing the official descriptions for chicken breeds, before the genetics were understood, named the comb...