If you have members in your team who would not be accessing your Freshdesk Account on a daily basis, but only a few days in a month, you could add them as Occasional agents to your account. Occasional agents would not take up an agent seat in your account, but would only consume a day pass each time they access your account. For detailed information regarding day passes, please refer to this article.
For creating occasional agents go to Admin --> Teams --> Agents --> New Agent --> Occasional. On that page, you could enter the agent's information and click on "Save" to add the Occasional Agent to your account.