I don't think we need to actually say that the snake and frog are anyone. I mean yes it is clearly referring to Seth but we have no idea still what events it's describing, if it's a literal thing that happens or a metaphorical depiction of something Seth goes through/feels (though personally I feel that the latter is more likely and that we'll find out what events it's paralleling in OSS.)
Imo it's good enough to just put a trivia point that the one-eyed snake line points specifically to Seth.
Ok so if the frog and snake are just a frog and a snake then I am done. I was thinking that Seth kinda "wore" Lich in the ark like the snake wore the frog's skin but whatever. Can someone proofread it before i post it?