This creature appeared in Expedition to the Barrier Peaks:
When this encounter takes place roll as if on the wandering monster table, look unhappy, and then show the group Illustration #42, “The Cute Little Bunnyoid on the Stump”.
This predator comes from the same planet that the abundant rabbitoids seen all over the level come from. It has developed a fleshy growth atop its body which exactly duplicates one of these harmless herbivores, and it wiggles and displays this bait to lure others of this kind -- or creatures which prey upon them -- to it. The wolf-in-sheep’s-clothing has likewise adapted its body form to resemble a tree stump, while its mobile and grasping tentacle roots appear to be nothing more than gnarled tree roots, and its eyestalks appear to be vines or plant growths. The rabbitoid lure will seem to look at approaching creatures, and then crouch and “freeze” in order to pass unnoticed. When prey comes to within 8’-10' of the creature, the root tentacles will strike to grab, crush, and draw prey to the maw.