cogs for front wheel
If you really need a freewheel on each side, that both drive the wheel forward, then you would need a custom built hub with a left hand freewheel thread on the left hand side, and you'd need to build a left hand freewheel too.

If you just needed a freewheel on the right hand side, just use a single speed bike rear hub.

You would of course need a custom fork for either as rear hubs are wider that front hubs.