Yep, most if not all purebred breeds should be good foragers, honestly. Everyone's going to give you a bunch of different responses.
However, some do rule over others, but climate is the number one determinant of what breed does well. These in general are usually good with a good "wild" type instinct:
American Games, Oriental Games, Araucanas, and most other light-type breeds such as Polish, Leghorns, Minorcas, Anconas, La Fleche, etc. Because of their lighter frame or smaller size, they do not require so much fatty foods, and aren't as laid-back.
But, again, it depends on climate, and many other bigger breeds are just as good or better. A second huge factor considered is how they are brought up in life. If they get to know the free range environment early on, they're better suited. Broody raised chicks especially increase their instinct and intelligence; less dependance on chick feed, which matures to hen feed.