Fidget Shrooms! You can:
Pull it,
Twist it,
Pop it,
Push it,
And smush it!
These are therapeutic toys for those who are Neurodivergent. I myself was diagnosed with ADHD at 12 and know what its like to need something to do with my hands to focus and stay calm.
This is a perfect gift for ADHD/Autistic children, and adults.

Pattern can be done in under an hour and doe not require a lot of yarn. Multiple sizes can be made by using bigger yarn, doubling or tripling stranding the yarn, and using a bigger hook to make the pattern bigger, or using thinner yarn and a smaller hook to make the pattern smaller.