Pooch Cafe by Paul Gilligan for October 03, 2013
Transcript:
Poncho: Hi, Sheldon! Hi, um, shoot, what's your son's name again? Sheldon: You know perfectly well what his name is! I made a mistake okay?? Why won't anybody ever let me forget it?! Bob: Daddy, what-- Sheldon: I want you to know, Bob, that your mother was equally to blame.
They do use “onomatpoeia” to describe the words in comics like “pow” and “zap” but it wouldn’t be appropriate to classify a soundless action by that term, would it? I searched further and didn’t find any discussions, but some sources mention “action words” in comics. I think that would work for “bob” here.