Yes, when you purchase your plan, you can change the billing frequency and currency you are opting for.
Access Subscriptions from the switcher. You will be redirected to the My Subscription window.
If you have a single subscription, you will directly see the Subscription Summary. If you have more than one, you will have to choose the Subscription you wish to manage as shown below. 
Select Manage Trial in the top left corner of the screen.
You can switch currencies from the drop-down in the top right corner. Once selected, your changed currency will be listed in your Subscription Summary too.
You can then click Continue to process billing in your chosen currency. You will also receive a success message.
For further questions, please write to billing@freshworks.com.