On which tegus you are referring too. Arg. Reds need more fruit to aid in shedding than say black & whites. Blues pretty much follow the black and white diets, though tend not to take too veggies as easily as B/W's. Age can also play a factor, as younger/babies need more meat protein and fruits are not readily eaten by younger ones.
Reds love strawberries, bananas, melons, apples, grapes for instance are good staples as far as fruits. Veggies can consist of potatoes, peas, green beans, some squash (summer/yellow). Bert at agama international (do a search for it on yahoo, etc) feeds his a ton of mashed potatoes and his site offers valid and empirical research findings on black and whites' diet. Ron St. Pierres www.bluetegu.com (i think that's still it) offers general diets for reds and blues.
Now columbian b/w's and guyana golds tend not to eat fruit or veggie matter too often, though most of the golds I've had will eat the san diego zoo diet on occassion which has fruits mixed in.
Good luck!!!
Greg