Yes, see step #2 of Jep's answer -
2. Find a Form ID
In the Marketo UI, select the form and look at the URL: it should be of the format app-x.marketo.com/#FO8B2ZN12. Behind the # sign, look at the number immediately following “FO” to find the Form ID. In this case, the Form ID is 8. In some cases, your first form may be numbered 1001 and count up from there. The Form ID is a variable, so that you can trigger the submission of different forms.
6. Decide Which Fields to POST
You can include any Marketo Lead field in your form submission. Please note that field names are case sensitive. In addition to the fields you want to submit there are two mandatory fields and two recommended fields:
Mandatory fields on the form:
· munchkinId - enter your Munchkin Account ID as the value
· formid - indicates which form in Marketo has been submitted
Recommended fields on the form:
· Email - this is used as the primary key for deduplication; if it finds a matching email address in the Marketo database, it will update the existing record, otherwise it will create a new record; if multiple matches, it will update the most recently updated record
· _mkt_trk - this carries the cookie information, so you’ll be able to track the individual’s web page visits; if you have Munchkin on your form page, the Munchkin will automatically enter a value in this (hidden) form field. If no, read it from the cookie with the same name and pass it to Marketo in this field