When I was a child (5ish) my mum and I sewed a little dragon plush together. It was too cute to be smaug and I hadn’t read the Hobbit yet but I love it. Making it was fun too, I have no idea how my mum figured it all out. The suggestion I saw with a pattern seems good but I also wanted to add that for me personally being involved in making my cuddly toy was great and if your child is interested in sewing or just generally being creative (which seems likely) that could be a great experience for your child.
That’s a really weird way of spelling The Hitchhiker’s Guide to the Galaxy.
(I should learn toki pona so I could at least translate the holy book’s title)