The variant spelling with an excrescent ‘r’ has no etymological grounds, and, according to the OED etymology, can only be explained as possibly by association with cider n. (Anglo-Norman cicer).

English pomade n.2 for scented grease preparation or ointment is attested from 1562, and the OED etymology suggests that apples may have originally been an ingredient to perfume the ointment. Such a sense is not attested in Anglo-Norman: The Five Med MSS citation was originally defined as ‘cream, ointment’ in AND¹, but the chronology and textual context suggest that at this point the word pomade simply referred to the juice of apples, here used upon a medicinal plaster.