The Singtoo is a Maxis-made creature present in the final game. It is similar subspecies to the creatures Singwon and Singtwee. Unlike the other two, it has the "Terrorpin" mouth instead of the "D'orca" mouth. Among the three, it has the highest attack value. Like the others it has a row of bony protrusions on its back, providing it with charm. It can sing but not very well.
The "too" ending may be a simplification of the number two or can mean that it is descended from Singwon or Singtwee.
The Singtoo later evolves into a Maxis-made empire called the Flixxel.