How to track turn-taking in Catan
Use the dice themselves as a reminder of whose turn it is.  This avoids the need for any extra tokens or start player marker.

If players roll them in front of themselves and then they physically pass them to the next player once their turn is over. It should then be clear whose turn it is.

That way a player can't roll twice as dice are already in front of them.  A player can not be skipped as the dice are passed to them by the player ending their turn.