An adjective for “of tongue, spoken with tongue” appearing in notes on Words, Phrases and Passages from the Lord of the Rings from the late 1950s or early 1960s (PE17/46). In Notes on Names (NN) from 1957 Tolkien instead gave lammen as the first singular possessive (“my”) form of S. lam “tongue” as part of a paradigm of possessive suffixes (PE17/46), which is more consistent with the translation “of my tongue” from The Lord of the Rings in the phrase fennas nogothrim, lasto beth lammen (LotR/307). The existence of the possessive form doesn’t necessarily preclude the existence of the adjective; see the discussion of Sindarin possessive pronouns for more information.