This would make a good cushion for the thumb
I just crocheted a antler for the reindeer hat I'm making. It fits over my thumb nicely although I would want it to be a bit longer. I noticed that when I crochet my hand stays in the same place but my thumb moves back and forth. I am right handed and I hold my hand on top of the hook. The hat I'm making is in the book 'Ho Ho Celebrations' by Loops and Threads.
https://www.amazon.com/Ho-Celebratio.../dp/1223008460
https://www.ravelry.com/patterns/sou...o-celebrations