Thor No. 366 (Marvel Comics, 1986). Cover art by Walt Simonson.From
obsessivecomicdisorder: LOKI turns THOR into a FROG (ISSUE #363)
peppermonster: nerdsoup: (via Pet Avengers: Thor Frog by *skottieyoung)
nerdyfacts: (Source.) OH is this why Thor turned into a frog
Thor Frog by Skottie Young