Piggy is fully aware that Ralph is the only thing that is preventing Jack from becoming chief. Piggy knows that if Jack does become chief all hope of rescue will disappear because Jack will only bother about hunting and the signal fire wil be forgotten. Piggy is also fearful for his own safety.
Piggy is Ralph's best ally but he does not stand up for Piggy.
Ralph wants to get Piggy's specs back and Piggy wanted to kill Jack there and then.
he keeps on saying piggy piggy and he lets jack and the other know his name and they teases him about it
Ralph and Piggy use a conch shell to call the boys together.
Ralph admired Piggy only in the end, once he wept for him. He admired him for remaining civilized and intellectual. Otherwise, it was Piggy who admired Ralph. Hope this helped!