From Guild Wars Wiki
Wallows are chubby gray creatures with spiked hides. Wallows have been domesticated by the Kurzicks and the Dredge. They are known for eating Truffles and, as such, are often hunted in order to obtain the food in the Wallow's digestive tracts.
 Types of hostile NPCs
|Guild Wars Factions|
|Pongmei Valley, The Jade Sea||24 (26) Rot Wallow||Rot Wallow Tusk|
|Echovald Forest||24 (26) Fungal Wallow||Truffle|