Shiisaa: 'kurai tsuki' +1 (4 MP)/Mazio +3 (12 MP)/Rakunda +2 (6 MP)
The ku in kurai is to eat; the rest is in hiragana so not sure what tsuki would be here. Anyway, it's a single target, small/weak power physical attack, with the 'higher power when a critical occurs' clause.
Jack Frost has Jack Bufula, which is Bufula + Rakunda in one. IIRC, we've seen glimpses of King Frost casting something with a unique name (was it King Bufula or something like that?), but no description... right, it was King Frost casting King Bufula in PV 02, right after Alice casts Shindekureru?/Die for Me!