From Hell It Came

Beware Tabonga! On a remote South Seas island, no one is safe from this hideous...and unique...monster. Tabonga is part man, part tree, all doom. Formerly an island prince, he was unjustly put to death by a witch doctor. Now he's returned to life with roots, branches and a vengeance. Against natives. Against visiting American scientists who investigate the tree's radioactive green sap. Against anyone unwise enough to expect a tree to stay put...