There is one right by the pond entrance at the spot where Navi is green. There is also one on top of the lakeside laboratory going up to a ladder.
After you get to the top of the theives hidout in Gerudo Vally then stan right by the edge at the part where you can't reach across to get a treasure chest. Then play Scarecrows Song and he will pop out, then go as close to him as possible and use your hookshot.
When you warp to the Fire Temple then go to the right and follow a big long piece of wood to a platform then turn right and go to the end of another one and play the song for the scarecrow and hookshot over there then you have to play it again at the end of that platform and another scarecrow is supposed to come up but I haven't gotten him to get him up yet though.
One is located in the Lost Woods when you first enter the place with all the big guys that charge you when you move to fast. When you go to the spot with the first big charging person (thing) look up when you are just out of reach of the guy. Now where you see Navi turned green is where the scarecrow will pop out. Now hookshot it and you will just have to run on top of the walls so the guys can't charge you.
The other is situated in the Shadow Temple. When you jump off the sinking ship and get the boss key, you can go outside the place where there are those claw things and 4 doors on each corner (one having a key another having the boss key) then leave that place and look for an ugly bone piece that is right beside the water. Stand on that piece and then play the Scarecrow's song and a scarecrow will pop up on the other side.
