Leaper

Leapers are large Decepticon brutes that jump around a lot and can only be defeated by being attacked from the back. Jazz doesn't like them that much.

Transformers: Fall of Cybertron
The large and intimidating Leapers act as heavy melee troops in the Decepticon ranks. Although normally rather slow-moving, they can generate great bursts of speed for short periods of time, allowing them to deliver vicious charging attacks. In open-roofed areas, they can also live up to their names by jumping high into the air, creating a large, powerful shockwave on impact with the ground.

The front side of a Leaper is heavily armored, making head-on combat suicidal at best. However, like Brutes, Leapers are vulnerable to attacks from behind, due to the large engines on their backs.