Albert Barnes Commentary Psalms 29:6

"He maketh them also to skip like a calf; Lebanon and Sirion like a young wild-ox." — Psalms 29:6 (ASV)

He maketh them also to skip like a calf - That is, the cedars of Lebanon. Compare (Psalms 114:4), The mountains skipped like rams, and the little hills like lambs. (Psalms 68:16), why leap ye, ye high hills? The meaning is plain. The lightning tore off the large branches, and uprooted the loftiest trees, so that they seemed to play and dance like calves in their gambols. Nothing could be more strikingly descriptive of “power.”

Lebanon and Sirion - Sirion was the name by which Mount Hermon was known among the Sidonians: (Deuteronomy 3:9), Which Hermon the Sidonians call Sirion. It is a part of the great range of Anti-Libanus.

Like a young unicorn - On the meaning of the word used here, see the notes at (Psalms 22:21). The illustration would be the same if any young wild animal were referred to.