in pursuit of my own branch of the Todds (Redworth, Heighington and Archdeacon Newton) I did spend some time going through wills on the North east Inheritance database, trying to work out links between various families of Todds. The only Cockfield Todd in the database, sadly, was John Todd, tallow chandler, who left a will in 1817, so is roughly the same date as your Todds. What was interesting was that he was obviously one of the West Auckland Todds, leaving a bequest to his nephew Fryer Todd, son of his brother Ralph in West Auckland and his other nephew, Fryer Todd again, son of his brother William in London. It may have been sheer coincidence hat he ended up living in Cockfield, but he obviously owned a lot of property there, which suggests that the family was well established. No mention of a Thomas Todd, sadly.
if you felt like working from an earlier date for a change, the 1666 Hearth Tax records give a Christopher Todd