Here's my two cents:
Its a Barred Rock Rooster.
At that age, the comb is too pronounced to be anything else but a roo. As for it being a Barred Rock, the beak is definitely yellow. According to Storey's Illustrated Guide to Poultry Breeds, p. 69 "Beak, shanks, and toes are yellow." Marans have horn beaks and slate legs. (p. 62)
I have a barred and plymouth rock roosters and their combs were like yours at an early age. Their shanks were yellow/slate turning to yellow as they got older.
Marcy
Its a Barred Rock Rooster.
At that age, the comb is too pronounced to be anything else but a roo. As for it being a Barred Rock, the beak is definitely yellow. According to Storey's Illustrated Guide to Poultry Breeds, p. 69 "Beak, shanks, and toes are yellow." Marans have horn beaks and slate legs. (p. 62)
I have a barred and plymouth rock roosters and their combs were like yours at an early age. Their shanks were yellow/slate turning to yellow as they got older.
Marcy