What should I feed my iguanodon?

I'm not sure if you mean "What should I feed my iguana?" or "What should I feed my Iguanodon?"

Iguanodon died out between 126 and 125 million years ago, and although we know they were plant eaters, we don't know specifically what plants they ate. Because they are extinct, nobody could have a pet Iguanodon.

Iguanas are lizards and are mostly herbivorous in nature, but some cases have been recorded of them eating dead fish or live mice. According to Wikipedia, staple vegetables that are good for iguanas include green Apples, tomato, mangos, butternut squash, green beans, snap peas, Okra, escarole, and collard greens. As for meat, feeding an iguana excessive amounts can cause numerous, severe health problems, and most experts say you should never feed an iguana any meat at all. Additionally, they require a precise ratio of minerals (2 to 1 calcium to phosphorus) in their diet.

On another note, iguanas need to be kept at temperatures between 79 and 95 degrees Fahrenheit and supplied plenty of UVA and UVB light. Without adequate UVA and UVB, they can't make Vitamin D, and without Vitamin D they can develop a deadly bone disease.

As with any pet, you should do thorough research before getting an iguana. If you haven't researched and already have one, I suggest you start researching proper iguana care right away.