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in the main room
you need to go to the lakebed temple in lake hylia
in the lakebed temple
No he is not in the temple but after you beat Lake Bed temple he is in a cut scene after you beat the temple so WATCH CAREFULLY.
kill the lakebed temple boss or collect enough heart pieces
In the first temple
Beat the first three levels. Forest Temple, Goron Mines, and Lakebed Temple.
The Temple of Time, the entrance of which is in the sacred grove.
The frog miniboss is in the Lanayru province, in the Lakebed Temple. See 'related links' for a map; the miniboss is in room 9.
get the boomerang.
The big key
you have to get the double clawshot from the miniboss.