ok, here's the fiend folio - i'm sure i'm missing a few, i did this kind of quickly.
Aarakocra – MoF
Achaierai – MM
Adherer – CC, ToH
Aleax – BoED
Algoid – CC, ToH
Al-mi'raj – CC, ToH
Apparition – CC, ToH
Assassin Bug - CC
Astral Searcher - CC
Babbler – CC, ToH
Bat, Giant –
Berbalang – CC
Blindheim – CC, ToH
Blood Hawk – CC, ToH, FF
Bloodworm, Giant – CC
Bonesnapper – CC, ToH
Booka – CC
Bullywug – MoF
Bunyip - CC, ToH
Carbuncle – CC, ToH
Caryatid Column – CC, ToH, FF
Caterwaul – CC, ToH
Cifal –
Clubnek – CC, ToH
Coffer Corpse – CC, ToH
Crabman - CC, ToH
Crypt Thing - CC, ToH, FF
Dakon – CC, ToH
Dark Creeper – CC, ToH, FF
Dark Stalker – CC, ToH, FF
Death Dog – CC, ToH, FF
Death Knight – CC, ToH, MM2
Demon, Lolth – D&DG
Denzelian -CC,
Devil, Styx Devil – MM2 (amnizu?)
Devil Dog – CC, ToH
Dire Corby – CC, ToH
Disenchanter – CC, ToH, FF
Doombat - ToH
Dragon, Oriental – OA
Dragonfish - CC, ToH
Dune Stalker - MM2
Elemental Princes of Evil, Cryonax – CC
Elemental Princes of Evil, Imix –
Elemental Princes of Evil, Ogremoch – CC
Elemental Princes of Evil, Olyhdra – CC
Elemental Princes of Evil, Yan-c-bin – CC
Elf, Drow – MM
Enveloper -CC
Ettercap – MM
Eye Killer – ToH
Eye Of Fear And Flame - BoVD
Firedrake – ToH
Firenewt – MoF
Fire Snake – CC
Firetoad –
Flail Snail – CC, ToH
Flind – CC, ToH
Flumph – CC, ToH
Forlarren - CC, ToH
Frost Man - CC, ToH
Galltrit – CC
Gambado – CC, ToH
Garbug – CC
Giant, Fog –
Giant, Mountain -
Giant Strider – MoF
Gibberling – MoF
Githyanki – PsiHB, MoP, MM
Githzerai - PsiHB, MoP, MM
Goldbug – CC
Gorbel – ToH
Gorilla Bear – CC, ToH
Grell – MM2
Grimlock – MM
Gryph – ToH
Guardian Daemon - CC, ToH
Guardian Familiar -
Hellcat – MM
Hoar Fox – CC, ToH
Hook Horror – MM2
Hornet, Giant –
Hound of Ill Omen – CC
Huecuva - CC, ToH, FF
Ice Lizard – ToH (ice drake)
Imorph –
Iron Cobra - CC, ToH, FF
Jaculi – ToH
Jermlaine - MM2
Kamadan – CC, ToH
Kelpie – CC, ToH, FF (not really, heh)
Kenku – CC
Khargra – CC, ToH
Killmoulis – CC, ToH
Kuo-Toa - MM
Lamia Noble – CC
Lava Children – CC, ToH
Lizard King -
Magnesium Spirit – CC, ToH
Mantari – ToH
Meazel – MoF
Meenlock – MM2
Mephit, Fire – MM
Mephit, Lava – MM (as Magma)
Mephit, Smoke –
Mephit, Steam – MM
Mezzodaemon –
Mite - ToH
Necrophidius – CC, ToH, FF
Needleman – MM2
Nilbog – CC, ToH
Nonafel – CC
Norker –
Nycadaemon -
Ogrillon – ToH
Osquip -
Penanggalan – OA
Pernicon – CC
Phantom Stalker – CC, ToH
Poltergeist – ToH
Protein Polymorph -
Quaggoth – MoF
Quipper – CC, ToH
Qullan -
Retriever – MM
Revenant – MoF
Rothe -
Sandman – CC, ToH
Scarecrow – CC, ToH
Screaming Devilkin – CC, ToH
Shadow Demon – CC, ToH, BoVD
Sheet Ghoul –
Sheet Phantom -
Shocker –
Skeleton Warrior – CC, ToH
Skulk – CC, ToH, FF
Slaad, Blue – MM
Slaad, Death – MM
Slaad, Green – MM
Slaad, Grey – MM
Slaad, Red – MM
Slaad, Ssendam – CC, ToH
Slaad, Ygorl – CC, ToH
Snyad – CC, ToH (mite, pestie)
Son Of Kyuss –
Stunjelly -CC
Sussurus – CC
Svirfneblin – MM (as gnome)
Symbiotic Jelly
Tabaxi – CC, ToH
Tentamort – CC
Terithran – CC
Thoqqua – MM
Thork – CC
Throat Leech –
Tiger Fly – CC
Tirapheg – CC
Trilloch – CC
Troll, Giant –CC
Troll, Two-Headed – CC, ToH
Troll, Ice – CC, ToH
Troll, Spirit –CC
Tween -CC
Umpleby – CC
Urchin -CC
Vision – CC
Vodyanoi – CC
Volt – CC, ToH
Vortex -CC
Whipweed – CC
Witherstench – CC, ToH
Witherweed - ToH
Xill – MM
Xvart -
Yellow Musk Creeper - CC, ToH, FF
Zombie, Yellow Musk - CC, ToH, FF