I love sharing ideas with others.  I made these QR codes for my students.  It lets them connect to clips I use in teaching my lesson.  You could cut these apart and make a QRcode A-Z wall that is accessible or low enough for them, or clip them together on a ring.

Look for me on Teacher Pay Teachers:  Kindergarten with Tracie
https://www.teacherspayteachers.com/Store/Kindergarten-With-Tracie