crestie

plural cresties

1. informalA crested gecko (Correlophus ciliatus).

   A female crestie lays an average of 6 to 10 clutches during the breading^([sic]) season which lasts about 8 months.

   2020 September 12, Kevin N., “How to Breed Crested Geckos?”, in My Crested Gecko, archived from the original on 06 Jul 2022

   3 more examples

   "Cresteds," or "cresties," as they are commonly called, are docile in nature and relatively calm and easy to handle as pets.

   [2017 December 12, Kimberly Kay Lucas, “Crested Gecko Care And Information”, in Reptiles Magazine, archived from the original on 30 Nov 2022

   More recently, crested geckos have become the "It" reptile pet. […] Corn snakes are popular to this day, and I have no reason to think that cresties will not continue in popular favor.

   2019 March 1, Owen Maercks, “Taking Care of Ball Pythons”, in Pet Business, archived from the original on 20 Oct 2020

   Cresties grow to be around 8 inches (20 centimeters) long, with their tails accounting for almost half of that body length.

   2021 January 5, Mark Mancini, “The Cute Crested Gecko, Once Thought Extinct, Is Now Bred by the Thousands”, in HowStuffWorks, archived from the original on 29 Jun 2022

2. informalA crested tit (Lophophanes cristatus).
3. Northern EnglandbiologyA great crested grebe (Podiceps cristatus).