That’s all, murlocs do not lose poison. Have it captured on video, I started recording every single battleground game, because of things like this.
I think you mean Venemous, there are no Murlocs with Poison.
There’s currently one 1 minion with Poison in Battlegrounds and that is the tier 7 minion Tide Oracle Morgl.
No others exist.
I don’t like playing Battleground even though I usually end up in the top 4 when I do (rarely top 1), but if I remember correct there is a Murloc that can trigger the Deathrattle on the Venemous Murloc that moves the Venemous to another friendly Murloc when the Deathrattle triggers, there’s also the Murloc that gives it’s stats to a friendly Murloc when you sell it (don’t think it transfer the Venemous if it got it before you sell it otherwise this one also does the job)