Iguana bits are a consumable item in Fallout 3.
Originally made by Iguana Bob Frazier, who used the remains of human corpses supplied by Doc Morbid. It seems, however, that the true nature of the "iguana" meat was not spread very far, as eighty years later (around 2242) Son of Bob's Iguana Bits prospers in the New California Republic, where his son, Mikey, owns the stand.
Iguana bits restore +5 Hit Points, at the expense of increasing radiation count by +3.
They are commonly found on dinner plates all across the wasteland, from the various food vendors, or simply laying on the floor.