Sheep is always Sheep whether Plural or Singular
galaxy
A herd.
A group of nine is called an ennead.
A group of galaxies is called a cluster.
The answer is: a pack ! Isn't that easy?
a group of unicorns is called a unicircle or unicluster
The tail of a deer is called a tail.
its called a fleece
the dog is called BITZER
A forest, a grove, a wood, a copse, a stand of timber or even a jungle
A group of sheep is called a flock.
a litter