Squighog Boy

These boyz are a revamp of the old concept of Boarboyz as orkish cavalry. The big difference is that these Beast Snaggas ride on a vaguely horse-shaped squig simply called the Squig-Hog, instead of riding on warboars.
Precisely why they were invented in the meta is unknown, but presumably, it's to tie into the increased prominence of the orkish built-in ecology, and/or to give Feral Orks back their cavalry whilst distancing them from their Warhammer Fantasy (and now Warhammer: Age of Sigmar) counterparts.