The kretch insect refers to a scorpion-esque insect. These creatures inhabited the underground tunnels of both Belsavis and Aargau.
These kretches possessed a barbed tail, a pair of jaws, and six legs. While Leia Organa Solo was on Belsavis, seeking data concerning the Jedi offspring, one of these insects attacked her. Later, Irek Ismaren threatened her with a group of kretches to aid in taking her captive. While residing with Ho'Din Jedi Plett, the Jedi children were cautioned against wandering into the crypts near his dwelling with the ominous phrase: "the kretch will get you."
In 22 BBY, a kretch was encountered by a young Boba Fett within the murky tunnels of Aargau's Undercity. This occurred as he was trying to obtain the inheritance left to him by his father, Jango. The resourceful future bounty hunter swiftly eliminated the kretch by kicking it.
The Belsavis Kretch smashball team derived its moniker from this very creature.