Its true that potato head might be borderline. I suppose I prefer to make the effort and adjust my choices when someone points out my error, than make no effort and ignore feedback I am getting from others. Potato head was new to me and seemed like a good idea, and I did use it against myself. I generally will not insult anyone else's intelligence, but I do suppose that calling myself a potato head might perpetuate that kind of thing. Thanks for the suggestion!

To me, git is ageist.

That’s fair. Where I grew up no one uses that, I just pulled it from some suggestions on Reddit. I’m not actually familiar with how it’s used.

Doesn't fool fall in the same category?

I think of a fool as someone who makes a bad choice, but this isn’t the same as intelligence. Someone can be very smart and very foolish.

Also a typo made me realize that “tool” is perhaps a good non ableist insult.

Fool and goofball are even less subtle.