Gruntbot

Gruntbots are the main enemies made by Gruntilda in Banjo-Kazooie: Nuts & Bolts. The first Gruntbots you see in Nuts & Bolts are in Nutty Acres, near Mumbo's Nuts. Their color is pink. (You for now can call them Pink Rollers) In Act 4, the Gruntbots are red, and fly. (You can call them Red Rammers, and they are a pain) In Banjoland, on the construction bricks and snow-making machine, there are Stop 'n' Swop like eggs. Break the eggs, and cube-shaped gruntbots come out. They stick to your vehicle and slow you down.

Gruntilda mentioned before the final battle that Gruntbots was building machines while she on vacation.