Do anyone know or have an idé of what creatures could exist on Xagobah?

If you dont know of Xagobah here is a link

http://starwars.wikia.com/wiki/Xagobah

I'm picturing lots of swamps and wetlands filled with dragonflies, fish, mollusks, salamanders, mollusk-like amphibians, winged fish, that sort of thing. Maybe lizards and giant beetles in the deserts. Mix and match some creature body parts and then start writing them down until you have a couple that catch your interest to use as beasts of burden, pets, or dangerous wild encounters.

yeah have to do that I already have a "creature" idé

A gigantic slug-like creature such as was in the swamps of the planet Mimban (from the novel Splinter of the Minds Eye) could give the PCs a run for their credits.

You can check out the Wookieepedia description here .