can another person set up touch id on my iMac

Hello, rjbesse2.

Touch ID can be setup for each user account on your Mac.

Use Touch ID on Mac – Apple Support:

https://support.apple.com/guide/mac-help/touch-id-mchl16fbf90a/mac

You're welcome. 🙂

I probably should add that if you want to give another person access to your user account with Touch ID, all you have to do is login to your account then click System Preferences > Touch ID > "Add Fingerprint" and have your other person register their fingerprint as you did yours before.