Two different colored slime creatures.
Slime Creatures are green or purple blobs covered with eyes or teeth in Dust: An Elysian Tail. This opponent is found in virtually every area. These creatures are the first enemy on which the parry technique is demonstrated.
Strategy
To attack, they stick spikes out both sides and top, impaling Dust if he's nearby. Do not underestimate their speed and don't try to jump over them - they will spike you. You can bypass them by dashing, kill them with Fidget, or parry them.
Drops
Slime Creatures drop gems, blueprints, Slimy Coat, and Slimy Spike.