"Frozen" snowman who sings "In Summer" (4)

I believe the answer is:

olaf

(Other definitions for olaf that I've seen before include "St ---, Norwegian king" , "King --, cantata by Elgar" , "Scandinavian monarch" , "Name of five Norwegian kings" , "King and patron saint of Norway" .)

I've seen this clue in the LA Times.

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