Text from the now defunct section of Transformers.com with Energon character bios.

Primitive in thought and simple in speech, what Grimlock and Swoop lack in intelligence they make up for in strength. They have given the Autobots the tactical upper-hand in battle time and again sending Decepticon legions retreating in fear. Swoop will often use his impressive aerial maneuvers to confuse and distract an enemy while Grimlock sneaks from behind and stomps that enemy before they even know what hit them. They then use their combined strength to ensure that there is little left of their unfortunate prey. Although they are armed to the nines with powerful weaponry, Grimlock and Swoop prefer to take down their enemies with razor sharp teeth and talons.

Little is known about the intended personas of Energon Grimlock and Swoop.  Whether you see them as related to the G1 versions or those of any other Transformers generation, likely depends upon whether you see the Unicron Trilogy Series (Energon) as connected with any other Transformers continuity.

Grimlock:
Strength: 10
Intelligence: 7
Speed: 3
Endurance: 10
Rank: 9
Courage: 10
Firepower: 8
Skill: 10 

SWOOP
""Fear can hit targets unreachable to bullets."."

Affiliation: Dinobot
Function: Bombardier
Alternate Mode:  pterodactyl
First Cartoon Appearance: none
First Comics Appearance: none

Strength: 6
Intelligence: 6
Speed: 8
Endurance: 9
Rank: 5
Courage: 7
Firepower: 7
Skill:  7

Together, Grimlock and Swoop unite to form, Mega Dinobot!