You are not receiving interest as a nominee.
Nominee interest is interest that you are passing on to someone else.
Just report the interest.
If you did not receive a 1099-INT, enter it at the 1099-INT screen, even though you do not actually have a 1099-INT.
TurboTax will ask if the payer provided a Fed number (Employer Identification Number- EIN). When you answer no, it will let you proceed without it.