Is it possible to fill a Salesforce "Custom Object" through Marketo forms?

I have already synced the specific "Custom Object" which within it for example has "Address 1" and "Address 2". This custom object is associated to an Account.

Is it possible when creating a form to make the fields fill the custom object? If not what is the right way to be able to populate this? Given that for example in Marketo we never created custom fields called "Address 1" and "Address 2"

Thanks.