Chattaans evolved on a planet of harsh elements, which is what led to their often frightening, or at least jarring, appearance. More than one layman Terran has been head referring to Chattaanites as trolls, giants, or even dwarves.
Chattaanites can come in one of two main varieties. The first is a small, stout version with a max height of around three to four feet. The second is a large, burly version with heights of around eight to ten feet. Both types have rough, almost leathery gray skin, but the larger Chattaanite will also develop thicker patches of skin that almost resemble rough tree bark which grow out over vital areas. The larger Chattaans will also frequently have protruding tusks that jut out a little ways from their lower row of teeth.