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I haven’t played it in a long time, but I always enjoyed Super Tux Kart. It reminded me more of the Moorhuhn / Crazy Chicken Kart games than Mario Kart. In general, before Steam Proton made Gaming on Linux almost free of any hassle, I spent more time with free and open source games like Nethack or Battle for Wesnoth that are available in many Linux package managers.
I wish STK was on Steam :(
With everything going on behind the scenes with development and add-ons, 100% can vouch for SuperTuxKart. On my desktop I have way too many add-ons for extra tracks and karts that it’s not even funny.