InfoPath can have a data connection to receive data from a SharePoint form library. Once the ShP data is loaded, it's just form design, that is, using the data as you wish. You can use the list of FormNames (Titles) for the dropdown. Once a selection is made in the dropdown, you can get that item's URL link. There are plenty of tutorials on getting ShP data into InfoPath that should get information on doing this, such as this one, this one, and this one. Good luck!