There is no such CA tax form.
https://www.ftb.ca.gov/forms/search/Results.aspx?yearselected=12&TaxType=7&KeyWords=
I got notice from state of California FTB to file my previous year state tax and complete FTB 4602F, reply to FTB - Questionnaire, Part 2. I looked up for FTB 4602F but could not find anything.
I received the same notice, and am not sure where to find the form. If you find anything please share!
If you have an account at the FTB.ca.gov site, you can log-in to your account and view and print communications which should include forms and notices already mailed to you. If you do not have an account, you can create one but they will mail you an PIN snail mail. You will not be able to access the newly created account without the PIN
If you have received a notice from the California Franchise Tax Board, you may log in at this link and respond to the notice. You will need to have the notice number from the top of the letter.
California Franchise Tax Board Notice