Vocative of puika and lauva

[Vāvere]

How are the words puika and lauva declined in the vocative case?

[Sol Invictus]

same as in nominative (puika, lauva)

[Vāvere]

What about the words ending in -a that can be either masculine or feminine? Does their vocative form depend on the gender of the word like in the dative case? E.g. žūpa, nelga, and melša.

[Sol Invictus]

I don't know on what it depends, but it's not gender. Vocative can have multiple variants, but in general most words have form which is equal to nominative (except for musculine nouns ending with -s or -is), so you can get by without knowing vocative