Actual when Club Penguin first came out you WERE able to go into rockhopper's igloo. But Club Penguin changed it so now you're not able to go to it any more. Don't worry though, you didn't miss a whole lot, the igloo was really plain and boring haha.
Well the igglo was plain and boring so why would sombody make an igglo for him when he lives on a ship he's a piaraite