Ath'kethin
Elder Thing
According to the About This Product page of MC7 - Monstrous Compendium Spelljammer Appendix, the Giant Space Hamster was contributed by Roger Moore.Slightly off-topic, but who came up with the concept of giant hamster as a space-fantasy themed creature in the first place?
Did someone’s real hamster escaped during a game, started to chew one the player’s miniature while they weren’t looking and went « ahhh! Giant hamster! » or something?
granted, D&D has plenty of giant « something », but mostly because they would look menacing at 10-foot tall. Silly has been in the game pretty much from inception too but still; giant hamster appears like an oddly specific choice of critter…
[edit] oh and yeah, to me this spells « spelljammer confirmed! »
Which isn't a surprise, exactly, though there are a handful of other TSR staffers who would also have fit the bill.