Swamp is awesome from 1-9.
1-2 Kill rats and snakes outside Grobb
2-5 Kill Froglok Fishermen and Guards outsike Guk
5-9 Head to the hand
(3 on the map) and kill the Kobold Hunters, and higher lvl frogs. At 7/8 you can kill the swamp alligators too.
9-12 Sro orcs and wandering trash
12-18 Oasis crocs + Orcs
18-25 Upper Guk
This is the Troll/Ogre classic leveling experience! Substitute Oasis for Kurns tower in FoB if you are up for an adventure, or wish for a ZEM!