From http://www.noble.mass.edu/ref/fullmoon.htm
Native American Names
January - Wolf Moon
February - Snow Moon, Hunger Moon, Opening Buds Moon
March - Maple Sugar Moon, Worm Moon
April - Frog Moon, Pink Moon, Planter's Moon
May - Flower Moon, Budding Moon
June - Strawberry Moon
July - Blood Moon, Buck Moon
August - Moon of the Green Corn, Sturgeon Moon
September - Harvest Moon
October - Hunter's Moon, Moon of Falling Leaves
November - Beaver Moon
December - Cold Moon
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From http://www.fabandpp.org/cotm/moons.htm
January - Old Moon, Wolf Moon
February - Snow Moon
March - Sap Moon, Worm Moon, Crow Moon, Crust Moon
April - Grass Moon, Pink Moon, Moon of the Red Grass Appearing
May - Milk Moon, Flower Moon
June - Rose Moon, Strawberry Moon
July - Thunder Moon, Buck Moon
August - Green Corn Moon, Corn Moon, Sturgeon Moon
September - Fruit Moon, Harvest Moon
October - Harvest Moon, Hunter's Moon
November - Frost Moon, Beaver Moon
December - Long Night Moon, Cold Moon
Remembering that Native Americans were hunters rather than gatherers, I nominate March as Spader's Moon, though a case could be made for February or April.
-alga