It's a mini Gamzee, wooo! :
He's around 7 inches long and extra squishy and beany.[link]
Here's the pattern if you want to make your own grub! Feel free to use it any way you like.
It doesn't include horns or hair, so you can use it as a base for any grub you like.
This hair is made out of many pieces of felt glued on in layers. I'd recommend looking up a tutorial for plushie hair since it can be a real pain to make it work! I have also seen other grubs with hair made from black fur, which looks great if done right.
To make the lines on the body, I made three rows of stitches across the back and pulled them tighter and looser until they looked right.
The head should be sewn into a complete ball before you try to attach it to the body. Do not leave a hole in the head. (And please make sure you STUFF it before you complain that it's a weird shape! Gosh.)
Here's some crappy doodles to maybe help with where things go. [link]
If there's anything else you're stuck with, try looking through the comments section because I might have answered it before.
(It's very very unlikely that I will ever make a full tutorial for this!)