Rocket and Groot: Keep on Truckin' (Rocket & Groot Chapter Book Adventures) by Tom Angleberger

CAPTAIN'S LOG!

Back for more? Well then, BUCKLE UP! ROCKET and GROOT are at it again, along with the help of Veronica, the totally awesome super-intelligent tape dispenser (that's her, on the right!).

(((*BING*))) HELLO, HOW MUCH TAPE DO YOU NEED?

Our heroes crash-land on a new world called HappyHappyFunFun. It's a happy place, except for the out-of-control self-driving monster trucks, a supercomputer called Big Mama bent on ruling the planet, and SHARKS. LOTS OF SHARES. 
Rocket and Groot must use every trick up their sleeves to save the day and . . . 
KEEP ON TRUCKIN'!