Stalker Whales are a type of stalker. In Predator's Gold, the Green Storm are talking about how the previous stalker-makers were unoriginal, and that the Green Storm would make a whole variety of stalkers. One of the types they mentioned was a stalkerized whale that could swim under raft towns and bomb them from beneath as well as firing missiles. They were presumibly made. They may have fought in the Battle of Brighton, though the Green Storm wouldn't have wanted to have destroyed the Tin Book.