tuckahoe
noun
tuck·a·hoe ˈtə-kə-ˌhō 
1
: either of two arums (Peltandra virginica and Orontium aquaticum) of the U.S. with rootstocks used as food by American Indians
2
: the large edible sclerotium of a subterranean fungus (Poria cocos)
Word History
Etymology
Virginia Algonquian tockawhoughe
First Known Use
1612, in the meaning defined at sense 1