Pigs are spawnable farm animals. If you kill them they turn into ham. They will eat almost anything, including pork, but not bacon. They protect Piglets. In Remix, they become brokenhearted from seeing bacon and ham. In Unlimited they will merely be alarmed. Farmers will protect pigs while pigs will be loyal to them.
The pig's squealing sound was heard in the original Scribblenauts and Super Scribblenauts. Its oinking sound was heard in Scribblenauts Unlimited and Scribblenauts Unmasked.