Joseph Smith calls the Father "Jehovah" 4 times during his dedicatory prayer for the Kirtland Temple.
Section 109:34, 42, 56, 68, Doctrine and Covenants, The Church of Jesus Christ of Latter-Day Saints, accessed September 24, 2022
34 O Jehovah, have mercy upon this people, and as all men sin forgive the transgressions of thy people, and let them be blotted out forever.
. . .
42 But deliver thou, O Jehovah, we beseech thee, thy servants from their hands, and cleanse them from their blood.
. . .
56 That their hearts may be softened when thy servants shall go out from thy house, O Jehovah, to bear testimony of thy name; that their prejudices may give way before the truth, and thy people may obtain favor in the sight of all;
. . .
68 O Lord, remember thy servant, Joseph Smith, Jun., and all his afflictions and persecutions-- how he has covenanted with Jehovah, and vowed to thee, O Mighty God of Jacob-- and the commandments which thou hast given unto him, and that he hath sincerely striven to do thy will.