Minion

Like in DOTA creeps will play strategical role in LoL.

Neutral Creeps
Some heros need to strengthen up to be succesful in late game. They kill creeps hidden in the jungle to power themselves up.

Here are some of the neutral creeps you can find in middle of the LoL game area:

The dead still plague the aftermath of the Summoner's Rift, and those who chose to linger here have turned to ghastly Wraiths. These flying Undead attack any who happen to pass by, haunting their victims with visions of the death and destruction that took place here.

Stone Golem Imbued by the power of the Nexus, the planet itself rises up to bring forth a protector of its lands. The Stone Golems roam the forests of Summoner's Rift, imbued with the strength of the Nexus and acting against any who disturb the peaceful wake of this isolated battleground.

The scent of chaos fuels the flames in the heart of the Dragon. Drawn to this war-torn land, the mightiest of beasts has settled deep within the Summoner's Rift, awaiting the next great war. To those who wake this slumbering ancient, beware: for his sharp teeth and suffocating breath have been tempered by the bravest of Champions, and yet it is he that still thrives in the depths of the Rift.