It's not that he's doubting she can do magic, so much as its application method in this particular scenario. Freezing the slime does sound like a useful call, though, and it could make moving it a hell of a lot easier than scooping and praying. He opens his mouth to say as much, except a spark of inspirational dumbassitude strikes him instead.

He snaps his fingers and proudly declares, "Bippity boppity bush."

Eh? Ehh??

Because that's a way better pun than abraca-agriculture, and he... needed to let that out into the universe. It is in no way helpful to this situation, or their strategizing, but he experienced a full lapse of filter because of who he is as a person.

He gives it, like, a solid two seconds for her to either approve or disapprove, and then moves on with a shrug either way.

"I might actually have something that can help. If you take one side with your... wind situation, and I take the other, I think we can both blast a good chunk of it into a slime pile for you to freeze. Should be easy enough to haul out after that, and we can start planting."