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Mice are good, and eggs. It depends on why he needs weight. Is he an adult that has a nutritional imbalance or a young, growing lizard that needs a bit of weight? Just like people, you want to stay with a balanced diet, just more of it. I have found that a balanced diet of meats and fruit works best for steady weight gain. That can include mice/rats, chicks, fish, shellfish, meat pieces supplemented with calcium, egg, papaya, mango, berries, melon.
That ^ ^ ^ and why does he need to pick up weight, for health reasons or because you want him to be bigger? When properly fed on a normal diet a healthy tegu will gain weight either way. Along with exercise not just fat but muscle mass as well.