>>10658618>>10658626NTA, but they're Cybertron Scrapmetal - basically the series' equivalents of the Insecticons. They come in three flavors - yellow, red, and blue - and are basically robo-locusts; they eat everything, and have only animal-level intelligence despite possessing robot modes. I think I remember one of the humans on the show refurbishing a dead one into his personal mecha at some point.
Using their Cyber-key gimmick makes a serrated bayonet pop out of their back cannons.
I own the red one; been meaning to track down one of the yellow and blue ones to have a mini-swarm.