No records found for Name: Thomas Ambroise, Event: Birth, Place: Marceilles, France, Event Range: 1855-1857
If you haven't already checked the records, the parish and civil records for Marseille (?)) are online. Marseille is quite a big town so a lot to sort through . I would therefore start with the Decennial tables.for births (naissance) for surnames beginning with A for the time period in which you think he was born. This will give you a date to then look for in the civil and parish registers.
Here is the site http://doris.archives13.fr/dorisuec/jsp/system/win_main.jsp
If you aren't sure about French records then this might help.