OoT Grottos

Grottos:
[open] is open by default
[exp] needs explosive or the hammer to open
[SoS] needs song of storms to open
[red rock] needs hammer or a weirdshot to enter
[silver rock] needs silver gauntlets or a weirdshot to enter

Kokiri forest:
[SoS]By LW entrance- 20r standard grotto

Kakariko Village
[exp]Kak center: redeads-200r chest
[open]By the ladder to windmill: 20r standard grotto

Hyrule Field
[exp]Inside four fences by lake entrance: heart piece for 10r from scrub
[open] Next to tree by Lake Hylia entrance: blue rupee standard grotto
[exp]Secret hole by tree between Castle and Kakariko: Gold skulltula high up
[exp]Boulder west of castle: Standard grotto with 5r
[exp] NW part of Hyrule field- secret grotto near lone tree south of river: Heart piece underwater. Need iron boots or gold scale to reach it
[exp] NW part of Hyrule field- under boulder north of river: Fairy Fountain
[exp]Boulder SW of Lost Woods Entrance): 20r standard grotto
[exp as child,red rock and exp as adult]hyrule field rock circle by GV: [need fire to get to the things inside] cow, gs, gossip stone, 5 deku nuts, bomb drop

Hyrule Castle
[SoS] Bombable walls-gold skulltula, bugs, 20r, 5 seeds, 5 bombs, 5 nuts, gossip stone

DMT
[exp]By rocks going up to top: cow and 26r (infinite rupees)
[SoS]Rock circle by goron city entrance- 200r chest inside standard grotto

DMC
[exp]Center of rocks near DMT entrance: standard grotto with 20 bombs
[red rock]By DC entrance: three scrubs-5 nuts for 20r, 30 arrows for 70r, 5 bombs for 40r

Lost Woods
[exp]By Goron City entrance: standard grotto
[exp]By SFM entrance: two scrubs-deku nut upgrade for 40r, seeds for 40r
[open] Lost woods stage: deku nut and stick upgrades

Sacred Forest Meadow
[exp]Entrance: wolfos-50r chest
[open] By ladders-fairy fountain

Lake Hylia
[open] Under gravestone: 3 scrubs: nuts,arrows,bombs

Lon Lon Ranch
[child only] open at the south-eastern part of ranch: 3 scrubs-nuts,seeds,bombs

Gerudo Valley
[silver rock] octorok and 39 rupees
[SoS] behind tent - deku scrubs selling red and green potions

Gerudo's Fortress
[SoS]By boxes- fairy fountain

Goron City
[open] Fire room-3 scrubs: nuts,arrows,bombs (can use song of time block and hookshot to get to it)

Zora's River
[exp]Under rock on top area: fairy fountain
[open] Near the above one: 20r standard grotto
[SoS]Rock circle at bottom: scrubs-green potion 40r, red pot 40r

Zora's Domain
[SoS]On little island in lower area-fairy fountain