Nice rooster Steve, looks chocolate duckwing pattern to me. You're right to test breed with a black hen to prove it. Until you can test breed them, many patterned chocolates can't really be confirmed.
Julie, the one up front does "look" chocolate to me too. I'm not as sure about the one on the far left. Are they from the same parents? Did you hatch them? If neither then hen nor the rooster was chocolate, you have to assume the father is a chocolate carrier. If the chocolate is out of 2 non-chocolate parents, you can also assume that they are pullets because a chocolate carrier rooster cannot produce a chocolate cockerel with a non-chocolate hen.
I Love working with the chocolate gene. It's so easy once you know what you have for sure and predictable. You can call them anything you want but if they don't breed as a chocolate should, they are not truly chocolate. That is the true test of the recessive, sex linked chocolates.
Just remember, brown does not mean chocolate. Brown is a phenotype, that means the color looks brown. Chocolate is a gene that makes a particulr shade of brown, generally dark chocolate brown. Most of the paler ones I've seen labeled as light chocolate are often not chocolate at all. A paler shade would mean there is something besides chocolate diluting the black in addition to chocolate. I have bred enough other dilutes with my chocolates to know there are not many possibilities to make "real" chocolate appear lighter visually. The only thing I've hatched so far that will actually do that is chocolate plus blue and it's an odd color, not the milk chocolate I see some people claim is chocolate. I am suspicious that some of those pale chocolates are not chocolate but red based with genes that change the way the red appears and I have hatched some of those, they have been pumpkin diluted. In the games, the pumpkin gene will make light golden with yellow hackles and sometimes a chocolate looking tail but they are not chocolate. The cocopop color is pumpkin dilute, not chocolate. It's on a wheaten base and has lacing. The combination appears chocolatey and the name cocopop seems to indicate something chocolate. Also, I've seen so many labeled cocopop this and cocopop that, that I'm pretty sure they are not all the same as far as genes.