Here's an up-to-date list of which pets I'm willing to trade:

Borm: Silver Mordo
Wraithlike: Ghost Snookle (eventually a Phantom Snookle)

HTP:
Dianmu: Thunder Lati (want to make her a thunder Zola; much better species for a thunder goddess!)
Sleuther: Tundra Poera
Zuro: Halloween Olgue

VHTP:
Defiler: Voodoo Gobble
Sylvaria: Midnight Mordo

From My Cold, Dead Hands:
The rest 😆