Pond Scum — Alan Silberberg

Oliver is the type of kid who enjoys pulling the wings off flies just to hear the little snap. Needless to say, he's more friendly with his television than with other kids. Oliver's life takes a turn, though, when his mom gets a new job and moves the family to a small town. Worse, his mom has fallen in love with a rundown old house near a pond. But there's something weird about the house. It seems to be guarded by creatures from the pond-creatures who decidedly don't want the family move in.