Rabbit, bunny

A rabbit - sometimes called a bunny - is either a really poor batsman, usually a bowler who bats at number 11 - who is unlikely 'to trouble the scorers' or a batsman - sometimes a very good one - who is unusually vulnerable to a particular bowler or style of bowling

The names presumably derive from the tendency of rabbits to freeze when caught in a car's headlights, often with disastrous consequences for their future wellbeing!