The Mosaic Grendels occupy Grendel slot O and were created using Geneforge/Eggforge and the scale pattern was pulled from a free to use texture resource and edited in GIMP.

They come complete with a modified CFE Banshee Grendel genome that replaces the desire to take eggs with toys, makes them less likely to clash with Norns when angry(though they still carry the gene), age slower and live longer lives.

You will need to install the bigger sprite allocation fix by Verm, otherwise your game will crash when they reach adulthood.

https://creatures.wiki/Bigger_Sprite_Allocation