In Treasure Trove Cove,

There is a rock jutting out of the undersea sand with a sign on top that says "Sharkfood Island". In the ending, Mumbo will show you a movie of Banjo and Kazooie exploring this rock... at the top they found a mysterious pink egg with a "?" stamped on the side... this cause rumors flying back and forth, round and round the internet... it was not a pretty site. Now, I'm gonna give my two cents on the matter.

Has anyone thought about what the island is called? "Sharkfood"? Snacker, the huge shark who roams the depths around this island, is a shark, and he certainly has some food... Banjo. Have you noticed, that how sometimes when he swims up to chomp you, he will say "Ahh... cheese and crackers" or "Mmm... mint and coffee!" or something like that? Well, that's food he's naming! Crackers are the subject I will be dwelling on. You know the Sand Castle codes? BanjoBegsForPlentyOfEggs? NowYouCanFlyHighInTheSky? They all rhyme! The island is Sharkfood, Snacker likes crackers, crackers are food, and cracker and Snacker rhyme! Just like the other Sand Castle codes!!! I now conclude with the thought that raising Sharkfood Island is the job of a Sand Castle code, which we will undoubtadly learn in Banjo-Tooie!! Geez, I'm a genius.