Itf means in trust for and is a banking allowance that permits the beneficiary to withdraw the funds upon presenting a death certificate.
Ttee means trustee which likely means that there is a trust that holds the asset. The beneficiary could be the trustee or some other third party. Sometimes the bank will obtain a copy of the trust when they establish the account. Other times you will just have to find it in the decedent's home.
The account that says ITF now belongs to the person whose name appears after those letters. The other accounts may be subject to an actual trust, or they may be subject to the same rule. The simplest way to find out what the deal actually is would be to contact the bank or broker holding the account. Take a death certificate with you.
Please, when you find out who it belongs to, that person should close the account. If the person the property was in trust for dies before the account is closed, the property would likely wind up in the estate of the person who set up the account.
If there turns out to be a real trust involved, you may have some digging to do, since you will need the trust document itself in order to get the money. But start with the bank or broker.