Racism alert. Google nom nom and there are many references, dog food, Oriental cuisine and others but couldn’t see the one you mention.
Sounds like the kind of noise you'd hear if you put your ear to the bedroom door at one of Big Verns legendary tinder love-ins?
Long time between Sesame Street and it first being used on the internet. 40 years. Maybe why hard remembering the connection. Used to enjoy Sesame Street. Some great guests on it. First time I noticed Nom Nom when one of our dogs was having digestive problems and looking for different dog foods brought up Nom Nom. Which wasn’t much use as it was for deliveries in the USA.