Yes! You can get spawners of your own on Skyblock! You can buy them from the Spawner Shop, get them from some crates, buy them from other players, and sometimes win them in giveaways!
To mine a spawner you need a pick with silk touch.
Yes! To change a spawner type simply click the spawner with a spawn egg.
To help server performance spawners are limited to 8 per chunk
Sea lanterns will push passive mobs West when placed near spawners. This can be immensely helpful when building grinders!