JESwan
InfoPath by default will allow you to connect to the following
SQL
Access
SharePoint Lists (SP1)
Web Services

Personally I haven't had any experience with any TeraData systems but I
dont' see why you shouldn't be able to create a webservice that gets the
required data and then passes it through to InfoPath. As for specific drivers
for InfoPath I dont' think you'll find any as Microsofts catch all is to use
a webservice to access other sources of data.

Hope this helps

Cheers
Ben Walters