In a matter of moments, lots of things change.

Giggles steps a bit further from the ruckus, continuing to provide magical encouragement to the rest of the entourage.

Keshkaru hurls a glob of magical fire into the wagon. Perhaps miraculously, it doesn't seem to set anything alight. Instead, she's rewarded with another squishy thud; a repetition of the same sound Vorgrok caused a moment prior.

Tessara uses a few burning sticks as flaming projectiles. It's probably for the best that her aim is a bit off, as Vorgrok remains both a thoroughly obstructing presence and for the moment, unsinged. The Dwarf, for his part, manages to prod precisely the right place. He returns to the spot with more force, and the sledge encounters the sturdy wooden frame of the wall- just after smashing a third fleshy/planty thing into a squishy mess.

Finally, thanks in part to the various incendiaries, the air inside the wagon finally clears out enough to do better than make out vague shapes. The drawn shades on the interior of the windows come into focus, and a fourth (and final) huge, bulbous plant is revealed- attached somehow to the far wall. Three similar plants- lie in various states of destruction on the floor of the wagon, their almost 2-feet of length now oozing some kind of pollen-y pus onto the floor.
Spoiler: plant
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Think this thing- except about 2 feet long from top to bottom:

Map updated