Those are manure balls often caused because there is excess waste in their brooder, which cause's the chick to repeatedly step on the poop, and overtime can buildup to a "ball' like you're seeing. Suprisilying these balls don't resemble poop very much and can get very hard almost like concrete.
These balls need to be taken off or they can subsequently lead to infection of the surrounding tissue or can cause skeletal damage of the toes, and feet as it often becomes hard for the chick to walk.
Repeat this process as many times as it's needed, but you'll need to fill a little tub with warm water, and let the chicks foot, not body, soak in there for a few minutes to loosen up the poop. Gently tease your fingers away at the poop while doing so. Not a fun process by any means. but it needs to be taken care of.
https://the-chicken-chick.com/when-baby-chicks-need-pedicure-manure/
These balls need to be taken off or they can subsequently lead to infection of the surrounding tissue or can cause skeletal damage of the toes, and feet as it often becomes hard for the chick to walk.
Repeat this process as many times as it's needed, but you'll need to fill a little tub with warm water, and let the chicks foot, not body, soak in there for a few minutes to loosen up the poop. Gently tease your fingers away at the poop while doing so. Not a fun process by any means. but it needs to be taken care of.
https://the-chicken-chick.com/when-baby-chicks-need-pedicure-manure/