I’d like to know if it’s possible for multiple accounts (logins) to share access to the same survey.
This depends on what exactly you mean by multiple accounts. If you are speaking about two completely different SurveyGizmo accounts, unfortunately the answer is no.
You can have a copy of a survey transferred to another account, but this results in two unique surveys (one in each account). See details here:
If you mean sharing a survey between different users on the same SurveyGizmo account, this is possible via User Management. It would need to be set up by an account admin on the account. More info here:
I hope this helps!