Slime Creep

Creeper Slimes are explosive hostile mobs that rarely spawn in swamps among other slimes. They have the same appearance as a normal slime, but with a creeper face, and might be one of the most dangerous mobs there is in Minecraft.

Appearance
They look like slimes, but they have the face of a creeper. 

Behavior
They behave like any slime, but instead of a ramming attack, it explodes sending slimeballs careening towards the player causing damage. The slimeballs can be picked up later. Small creeper slimes cannot explode.