Gammo

Gammo is one of the three Aliens on the UFO in Jolly Roger's Lagoon. You have to activate all four generators with Ice Eggs in 20 seconds to power up the ship, allowing them to leave. They will give you a Jiggy in return and head to Hailfire Peaks to find their missing children.

In Banjo-Kazooie: Nuts & Bolts, the UFO was one of many props that made it into Banjoland. Also, he can be seen in the Terrarium of Terror.

It is interesting to note that while Alph only mentions three aliens by name and there are three in the character parade, there are actually four aliens in the UFO. The reason for this mistake is unknown.