The hyena in the original film who never speaks is Ed. He is one of Scar’s three hyena followers, alongside Shenzi and Banzai, and is characterized almost entirely through his manic laughter, facial expressions, and physical comedy.
Ed appears during the Elephant Graveyard sequence, where the trio encounters Simba and Nala after Scar sends them there. Unlike Shenzi and Banzai, who carry most of the dialogue, Ed communicates through cackles and gestures. This makes him a memorable silent-comedy character rather than a speaking villain.
A common mix-up is assuming that “never speaks” means Ed has no vocal sounds at all. He does vocalize frequently, but his sounds are laughs and hyena-like noises rather than spoken words. The 1994 film’s other hyenas, Shenzi and Banzai, are the ones who deliver the conversational lines.