You are utilizing Forms on Marketo Landing Pages, and want to run reporting on these forms.
Currently the only asset reporting Marketo has is Email, and a little bit of Landing Page reporting. We would not have this ability to report on Forms.
One option would be to use Web Page reporting - this reported information would be limited to Marketo Pages with numbers of records who filled out the form, listed under "conversions." You could then create a Smart List to identify leads who have filled out these forms.