Ah, the Kroot. Poor, neglected porcupine-vulture-people. GW hasn't given them a whole lot of love, with almost half their entire lineup now gone due to FW retiring the old Knarlocs.
But enough bellyaching. There's a surprising amount of people trying to show the Kroot the TLC that GW hasn't given them, most notably Modern Synthesist and his planned counts-as-Drukhari Kroot force "The Undevoured" (TLDR: They're Tyranid hunters!). And whilst I probably can't justify starting ANOTHER project, I do find the Kroot oddly fascinating. However, whilst they're best known for their beasts of burden and superevolutionary abilities, I always wondered what Kroot vehicles would look like. We know they have some technology- they make their own weapons, and the Warsphere is one of the more memorable BFG ships due to its striking appearance, so I don't find it impossible to believe that they'd make use of some forms of indigenous-designed vehicles.
I always thought they'd look quite alien, and fairly "scrappy" but not in an Ork "made of random junk thrown together" way- a T-34 to the Orks' Bob Semple Tanks. Think of the Brutes from Halo and their vehicles...all two of them. Rather, they'd be very functional and basic in design, quite jagged and angular, with a focus on ease of manufacture/repair over high-tech shenanigans. Most notably, they'd mostly be skimmers but would be powered by turbine jet engines rather than complex anti-grav or fusion reactors or whatever. I also figured that to go with the Tau having vehicles named after sea life, theirs would be named after reptiles. So for example:
>"Mamba" hunting skiff (basically a slightly heavier Piranha in function)
>"Crocodile" fast tank (a close-ranged and moderately armoured but very fast skimmer tank)
>"Snapping Turtle" armoured transport (essentially a Kroot land raider, albeit somewhat more expendable, a bit faster and more focused on being a mobile pillbox rather than a battle tank that can also act as a transport)
Finally, here's a slightly crap doodle I did of a theoretical design for the Mamba.