What makes you think, that Gale doesn't have a tadpole? There is nothing in the game confirming that.
I second this question. I think it's more than likely that Gale does have a tadpole.
I get that he's the only one who doesn't respond by immediately connecting with Tav, like Shadowheart, Laezel, Astarion, and Wyll do.
But there are moments when Tav can push into Gale's head, so I think the lack of immediate connection is more of an oversight in the introduction scene. Largely because it played out better with Gale acting as he does when he comes through the portal.
Gale also has a tadpole power that he picks up at the same time as the other characters.
Still, who knows? It would be interesting if he didn't have a tadpole, if Larian managed to sneak something like that past everyone in early access.
