Here are the pets which are currently listed in the pet journal of the beta as well as the ones we know about. As always, you can expect this list to change as more info comes in and I can flood the post with accompanying images.

Profession

Ancient Nest Guardian – Arch
Frostwolf Ghostpup- Arch

Lil’ Leftovers - Cooking

Lifelike Mechanical Frostboar – Eng
Mechanical Toucan – Eng
Iron Starlette – Eng
Sky-Bo – Eng

Sea Calf – Fishing

Elekk

Elekk Plushie – Tailoring

Reward

Ghastly Kid – reward from battling Eleanor

Digrem Orebar
Meadowstomper Calf – quest chain from Digrem Orebar by the Ring of Trials, ending with New Babies.

Hogs – WoW’s 10th Anniversary

Wild Pets

Gnawtooth Rat – Garrison

Moonshell Crab

Shadowmoon Valley

Mud Jumper – Nagrand
Leatherhide Runt - Nagrand
River Calf – Nagrand

Blue Axebeak Hatchling
Brown Axebeak Hatchling
Red Axebeak Hatchling
Green Axebeak Hatchling

Achievement

Royal Peacock – Draenor Pet Master

Drop

Albino Chimaeraling – Egg, Shadowmoon Valley
Carrotus Maximus – Draenor
Dwarf Gronnling
Runtish Gronnling

Grovestrider Hatchling

Grovestrider Hatchling – Teroclaw Nest

Sproutlings
Autumnal Sproutling
Forest Sproutling
Kelp Sroutling
Nightshade Sroutling
Sassy Sroutling
Sun Sprouting

Black Ravager Hatchling
Blue Ravager Hatchling
Brown Ravager Hatchling
Green Ravager Hatchling

Albino Ravager Wasp
Blue Ravager Wasp
Gold Ravager Wasp

Green Ravager Wasp
Red Ravager Wasp

Stonegrinder

Stonegrinder – Chest inside a motion sensor cave (Orunai Coast)

Weebomination
Zomstrok – Soulless Darktide Oracle and Reanimated Darktide Guardian, Shadowmoon Valley

World Event

Bush Chicken
Lovebird Hatchling
Syd the Squid
Stout Alemental

Cursed Birman
Widget the Departed

Blazing Cindercrawler

Unknown

Temporal Shard
Echo of Murmur
Draenei Micro Defender
Molten Corgi
Goren Youngling
Mystical Spring Bouquet
Blazing Cindercrawler
Limbflayer
Cursed Birman

This list is subject to change