"roam among" is correct and can be used in written English.
It is usually used to indicate an action of moving around in an open space. For example, "The deer roamed among the trees in the forest."
Several old dogs that seem to belong to no one roam among the tombstones.
Wild ponies roam among the Palmyra palms on this sparsely populated island.
Preparations for the three-hour funeral have overwhelmed the village where farm animals roam among single-storey roundhouses.
Rather, they simply wish to convey everone's potential for self-improvement, especially the doufuses (or is it "doufi"?) who roam among them.
We are told that in the Balkan National Park, which contains Europe's largest protected beech forest, wolves and bears (and golden eagles) roam among the mountains.
There are also companies like Boingo Wireless and Sputnik, which focus on software and services that make it possible for wireless users to roam among networks.
Roaming among their collections is their mixed-breed dog, Queenie.
It roams among more than a hundred and fifty works in the Welling Court Mural Project.
Or Kate Bosworth and Selena Gomez roaming among civilians, sporting floral dresses, or Jared Leto in zebra-print skinny jeans.
While his colleagues out West are roaming among the redwoods, Mr. Simpson is often looking for a parking space.
Enter by the Golden Gates (OK, wrought iron, but still...) and enjoy roaming among the profuse flowers.
