(Note: Yes I know that some sites have claimed that Don Brown voiced Porunga but after actually hearing Porunga in the EuroCanadian dub of DBZ it sounds more like Richard Newman.)
Porunga is the Eternal Dragon of Namek and he is capable of granting up to three wishes. He is a very kind dragon but also has a bit of a temper and can be a bit impatient too (but not as severe as Shenron).
In the English dub version of the Dragon Ball Z anime by Funimation Porunga is voiced by Christopher Sabat. For the Ocean Group dub of the anime Porunga is voiced by Richard Newman.