Kleggs are alien mercenaries in the Judge Dredd comic books.
A Klegg looks rather like a large man with green, scaly skin and the head and tail of an alligator or crocodile. They only take payment in meat, since they are pure carnivores. They are reasonably intelligent, but their ferocity and propensity for eating their foes dominate others' perception of them. Their society - the Klegg Empire - is essentially feudal.
In the story "The Day The Law Died", the insane Chief Judge Cal hired in the Kleggs to put down a rebellion inspired and led by the outlawed Judge Dredd. With their "Klegg-Hounds" (alien beasts rather like large dogs with crocodilian heads, which track enemies by tasting the ground where they have passed) the Kleggs kept the citizens of Mega-City One cowed and terrorized. Their battle-cry was "Klegg-Hai! Klegg-Hai!" and, in The Day The Law Died, they also preceded this with a war-song: "slicey slicey, oncey twicey, claw and fang'll kill Dredd nicely! Meaty beaty, chop 'em neatly, death or glory no retreatee!". Cal appointed their leader, Grampus, deputy chief judge.
originally performed by The Velvet Underground
Now, if she ever comes now now
If she ever comes now now
If she ever comes now now
Now, if she ever comes now now
If she ever comes now now
If she ever comes now now
Oh, she looks so good
And oh, she's made out of wood
Just look and see
She's made out of wood
Just look and see now now now
Made out of wood now