ZF (only three pets)

Skink: Found in 6 places! Crown drops are ultra rare.
1. Found in Waterfront. Dropped by Belloq.
2. Found in Mirror Lake. Dropped by Elephant Spectral Guardian.
3. Found in Drum Jungle. Dropped by Kallah Silverback. (I approve XD)
4. Found in Zamunda. Dropped by Shaka Zebu.
5. Found in Savannah. Dropped by Negral the burned lion.
6. Found in Waterfront-Black Palace. Dropped by Tim-tim Snakeeye.

Leopard: Dropped by same guys as Skink. Ultra Rare drop.
(I approve leopard dropped in Mirror Lake XD)

Hollow Knight: Is rumored to be dropped by Starburst spiders in Mirror Lake. (A friend said he got one there when I was with him)