Biomass

The biomass are technically fauna but since (most of them) are immobile I’m going to count them as flora. Biomass are created by multiple flesh creatures compiling together creating on big meaty slab. They are all different in many ways including some not having as many skulls as another, more mouths in different areas, more arms and sometimes even legs. Biomass are one of the main sustenances needed to keep the flesh alive. Biomass have roots which can spread up to 50 feet which all the nutrients they get from eating goes through those roots to sustain the land around it. The ones which do not have legs and cannot really fend for themselves are fed by other flesh creatures who bring them bodies. Most biomass are blind and cannot see yet some have up to 7 eyes. Every time they eat (depending how much) they grow into a larger size and sometimes grow extra limbs. If a biomass with legs and eyes spots another one on the brink of dying they have two options: merge together into one huge big biomass and lose its mobility or eat the dying biomass and gain more nutrients and get bigger.

Skeletal Mutated Horses

These things are basically just horses who got sucked in to the flesh and stuck there for days mutating into a huge abomination. The same as what happens to the victims of the Chompers (https://sticknodes.com/members/godzillamaster1/activity/1666224/), their skin starts to disintegrate into nutrients for the ever growing flesh.
They grow two huge tongues, grow (around) 5x their size, their skeleton is a lot more visible showing that they have less fat, their eyes glow a neon red colour, they lose ALL their hair, and their tail grows a lot larger.