So that people have references before voting:
This is an Ancient - https://www.wowhead.com/npc=147758/onu
This is a tome - https://www.wowhead.com/npc=116551/flying-tome
This is a Pandaren caterpillar - https://www.wowhead.com/npc=59754/mottled-caterpillar
And the article about this survey on WoWHead has a pic of a Maldraxxus goo-cat - https://www.wowhead.com/news=317821/blizzard-creating-free-shadowlands-mount-for-all-players-players-vote-on-mount
Edit: Forgot the Nerubian Swarmer - https://www.wowhead.com/npc=115137/nerubian-swarmer