Why? Spur-of-the-moment thing when I saw the green-with-purple-highlights colorscheme, which reminded me of the team's toys.

However, later I got to thinking... why just him? Why not try for the rest of his team as well?
But I kinda got stuck, as I couldn't think of suitable pets to fit the names.
"Scrapper, report!"
"All present are accounted for, noble leader: Scavenger, Mixmaster, Long Haul, Bonecrusher, Hook, and myself."
For reference/ideas, their personas and vehicle-modes, from TFWiki.net :
Scrapper, the leader, modest but masterful - front-load loader. This will be Greendexx.
Bonecrusher, a destructive berserker - bulldozer.
Scavenger, who has some major self-esteem issues - power shovel.
Mixmaster, manic and somewhat crazed - cement mixer.
Hook, a snobbishly perfectionist - crane.
Long Haul, a hard-working transporter - dump truck.
They don't need to be green like Scrapper - in the case of some pet types, green isn't even an option - but it would be a neat way to thematically tie them together other than the names.