Hey @Nikhil_Bhaskar,
Sadly Freshdesk does not have a Webhooks API which makes no possible to create a Trigger node.
The good news is you can still achieve the same result using the Webhook Node.
1 - Create a Webhook node and grab URL
2 - Open Freshdesk and go to Admin → Automations
This video below explains well the step 2. The only difference in your use case would be that on “actions” you have to select “Trigger webhook”.
A screen will pop up asking you the URL where you want to send the event data to, here is where you have to put the URL you grabbed from step 1.
If you explain the exact use case you are interested in I can help put everything together.
If you have any further question do not hesitate to ask.
Regards.