Do they have baseball jersey Iron patch numbers and name letters?

Yes, they do. They also sell blank jerseys in minimal selection. If you can't find it at Hob Lob, try Michaels nearby or JoAnn's. There's also a Big 5 Sporting Goods store down the street. You might need to order online to find exactly what you want.

They do have a number of letters and such. It would depend on what you need or prefer.

I did not see any of these, but I was not looking for them. I did not see to much of anything really sports related.