Meller's & Parson's chameleons can get pretty close to that.
The largest of the chameleons from the African mainland, large male Trioceros melleri typically reach 24 inches (61 cm) in length, but exceptionally large specimens have reputedly reached over 30 inches (76 cm) in length and have weighed 21 oz (600 g) https://en.wikipedia.org/wiki/Meller's_chameleon