This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鮬 combines 魚 (fish) with 夸, which likely contributes a phonetic element. The exact historical development is uncertain.
The left side is a fish 魚, and the right side 夸 looks like a person with a big head and arms. Imagine a strange fish that puffs itself up to look big, but its actual meaning is uncertain.
For ホ, imagine a fisherman holding up this strange fish and saying 'Ho!' in surprise: Ho -> ホ.