Fawn
The Fawn is a BASIC pet that was obtainable from the Christmas Tree Egg, with a 65% chance of hatching. It was only available for a limited time during the 2021 Christmas Event.
The latest Pet Simulator X value list for Fawn can be found below:

Regular
💎 64,000 (64k)

Golden
💎 185,000 (185k)

Rainbow
💎 571,000 (571k)

Dark Matter
💎 1,780,000 (1.78m)