The Collaborative International Dictionary of English v.0.48:
Sniveler \Sniv"el*er\, n. [Written also sniveller.] One who snivels, esp. one who snivels habitually. [1913 Webster]WordNet (r) 3.0 (2006):
sniveler n 1: a person who breathes audibly through a congested nose [syn: sniffler, sniveler]