Probably more doable with wheels than tracks. In the dark recesses of
my memory I seem to recall seeing a number of vehicles (probably
prototypes) over the years that used the wheels for propulsion on water.
One had 8 wheels and was about the size of a John Deare ATV. Not fast
but versatile. Could be useful on backwaters to get to a remote fishing
hole and a lot quieter than an air boat.

Ron