Argentines are technically omnivorous. I have a pair, and while I have seen them eat fruit and vegetables, I can tell that those foods are NOT their favorites. The bulk of my tegu's diet is whole rodents. I also feed them ground turkey mixed with multivitamin powder on occasion.
My tegus are adults, so their diets are regulated to prevent obesity. They eat one scheduled meal per week, usually on a Wednesday. I do this because I typically feed snakes on the weekends, and when I have leftover rodents, the tegus are hungry enough to ensure that they don't go to waste.
My smaller tegu will typically get 3-4 whole adult mice. My larger tegu will get 1-2 weaned or small whole rats. These guys will become huge fatties if you let them.
HTH
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