There are 3 Greyling Trophies

Greyling (small, brown and white with blue glowing eyes)
Greyling Brute (large, brown with orange glowing eyes -- unfortunately the Dandelion does not come with)
Greyling Shaman (large, green with antlers, green glowing eyes)

With the basic Greyling you will most likely have to kill a 2-star one.