i made a video on these questions two and a half years ago
my conclusions were:
laughtale is inside of a whale
lunarians hid joyboy there
imu's forces somehow made it there, slaughtered the lunarians but didn't find joyboy
joyboy's frozen corpse is still there
roger laughed because joyboy looked like a bum, he didn't achieve his dream so he entered his bad timeline; with bald spots, missing teeth and so on