If you thought Games Workshop would never mention squats again and their memory would slowly fade out into nothingness, the Warhammer Community is about the shock you.
From this mornings look at the Top 5 Mutations
In their article this morning they list the top 5 mutations as 1. The Psyker Gene 2. Wulfen, 3. The Pariah Gene, 4. The Black Rage, 5. Abhumans
https://www.warhammer-community.com/2017/09/04/celebrate-30-years-of-40k-the-top-5-mutations-in-warhammer-40000gw-homepage-post-3/
"Abhumans are mutants, humans who have, through deliberate genetic manipulation or chance mutation, fallen out of acceptable bounds for genetic purity. These range from the feral Beastmen to fan favourites like the Ogryns and Ratlings. Popular rumours abound of diminutive, intrepid humans called Squats, but such talk is surely rumour and happenstance."