We don’t really need an explanation. Until Munch’s sex has any relevance to the story, it’s irrelevant. He’s not female. He’s either male or, like Abe, sexless. The best evidence I can think of for either over the other is that Gabbits return to Ma’Spa to spawn, strongly implying that there are males and females in roughly equal numbers, just Grubbs and Clakkerz.
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