Crayon, that's a joke right?
Its just normal bark growth reaction.
As you can see, it's forming around the knuckles and places that have splits and joins together. Just one of many common things that happen when growing.
Its really nothing. If it were a disease, I'd be looking to see die off, or some bad reaction on top. And there's none. I don't know the name for it. But I know it's all good, or at worst you'll be able to carry them to harvest with the prob, if it even is a problem, which I'm nearly sure it's not.