Woods, 24, joins from Lorca Futbal club in Spain and features as a left-sided defender or winger. He has also played for Stalybridge Celtic.
Lennon, 18, is a left-sided defender and joins the club following his release from Port Vale.
Ten-Grotenhuis, 24, was most recently with local rivals Hednesford Town. He has previous experience at Bristol Rovers and Stratford Town.
Malbon, 17, joins on a short-term work experience scheme from Stoke City.
Finally, Whitehead returns to the club to give competition in the number one role.
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