Shouldn't offer carrots too often either as they can cause runny poo. Getting fecel done is always a good precaution to rule out parasites and typically it doesn't cost to much to do it.
In addition to the greens mentioned above, you can feed dandelions (greens and flowers). Kale should not be too often but is safe in small amounts. Swiss Chard, radish greens, beet greens can also be fed once in awhile. The key is a good variety with stables like collard greens, mustard greens, enchive, dandelions and escarole.
As your dragon is a year old he pretty much is considered an adult. He should be eating greens every day with crickets (or other insects) a couple times a week.