Ok I'm the first to admit I am no expert in 3d modelling. This is a combination of AI generated and hand edited to ensure the wheels and connectors worked properly. Its perhaps more of a “Wonky Nonk” but I couldnt find anything else to 3D print for this, so here you are!

I painted some nice colouring in layer heights so no wasted filament! I also set some of the plates as print by object to save time.
My niece's 2 year old loves it.

Use brims! or the wheels will come off the plate - you have been warned!