spawner

noun3

1. •
   A female fish, often specifically a salmon, which is physiologically ready to spawn
2. •
   A program which spawns objects or processes as needed
3. •
   An object in a simulated game world that spawns further objects.

   • […] at this point, there are enemy birds that fly out of the pipe and attack the player's avatar. The pipes themselves are "enemy spawners" […] — 2006