No, it seems these are lillies (flowers). The moor heads (as far as I know) first appeared in Spanish heraldry (in Aragonia) and refers to the ,Reqonquista' (reconquest of Spain from the invader - the Moors).
Here is a detailed description of the coat of arm, unfortunately only in dutch.
Founder: Pieter Moorrees, born in Nijmegen in 1546, later became mayor of the city.
http://www.wazamar.org/Familiewapen...wpn/hs-4.htmColours - first field green (groen), lillies silver (zilver),
field 2-3 gold (goud)
field 4 silver