There is one iguanid, nine geckos, nine skinks, and the Pacific boa (Candoia bibroni).    From Wordnik.com.  [Tongan tropical moist forests] Reference

The iguanid, the South Pacific banded iguana (Brachylophus fasciatus), is also found in Fiji and is believed to have rafted from the Americas.    From Wordnik.com.  [Tongan tropical moist forests] Reference