Arda has relatively few druids, not at all a complete circle. Those who are on Arda mostly wandered in in wildshape through one of the lightly guarded portals to other worlds from the Great Pyramid in Nexus Prime.
Arda Druids are granted their power by Yvanna, and thus part of the Church of Eru Ilùvatar, though on an entirely different heirarchy.
Gabrielle Harn is The Grand Druid of Arda(15)
Serenda Eldarwood - House Mariner is the Great Krynnic Druid of the Druid Circle of Arda. (14)
Chieftain Quriumalas Blooddog is the Great Harnic Druid of the Druid Circle of Arda. (14)
Rothis is an Arch Druid of the Greyhawkian Druid Circle of Arda. (13)
Pip Jollyfield is an Arch Druid of the Greyhawkian Druid Circle of Arda. (13)
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Liallor Silvenson is a Druid of the Greyhawkian Druid Circle of Arda. (12) - Druid(Avenger) L12 N Half Elf(std.)
Triolus Johnson is a Druid of the Greyhawkian Druid Circle of Arda (12) - Druid(Beastfriend) L12 NG Human
Lolyselas Goldmane is a Druid of the Greyhawkian Druid Circle of Arda (12) - Druid(Barbarian Berserker Priest) L12 N Half Elf(std.)
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Malechi Martinson is a Druid of the Greyhawkian Druid Circle of Arda (12) - Druid(Pacifist Druid) L12 NG Human
Raye Sunwonder - is a Druid of the Greyhawkian Druid Circle of Arda (12) - Druid(Wanderer Druid) L12 NG Human
Nicole Swansong is a Druid of the Greyhawkian Druid Circle of Arda (12) - Druid(Pacifist Druid) L12 NG Human
Marlil is an initiate of the Krynnic Druid Circle of Arda. (10)
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Larissa Snowmane is an initiate of the Greyhawkian Druid Circle of Arda (6) - Druid L6 NG Human