As I said earlier in the thread, I tackled such issues
here. But that was based upon the notion that munch is male, as we know, and the assumption that gabbits either do not change sex or that Munch does not need to. That would change my conclusion into... well, I would not be able to draw one with yet another unknown variable.
But I think we are safe in the assumption that Munch will not change sex. His is a character-driven story, and that would change who he is. Such blurring of gender distinctions is not going to be tackled in Munch's story, although it does have potential for an Oddworld commentary on modern attitudes to sexuality.