No. Mob spawners only spawn one mob type. If you want a different mob, you'll need to find another spawner that will hopefully be different. There are only 3 by the way. Skeleton, Spider, and Zombie.
It's hard to tell what it will spawn until it does because of the pig. Later in an update, it will be changed to where the mob the cage spawns will be shown inside the cage instead of the whirling piggy.
It's hard to tell what it will spawn until it does because of the pig. Later in an update, it will be changed to where the mob the cage spawns will be shown inside the cage instead of the whirling piggy.