Big, dim, acid-fingered fish-monsters of Kua-tin myth — lethargic until they can't reach you, then enraged.
Pollyslogs are large green fish-like monsters (level 22) lounging on a Yellow-Line platform — like full-sized, more monstrous Kua-tin with massive milk-white eyes. Per their (AI-still-salty) description, they're fearsome prehistoric Kua-tin-myth beasts: 'moderately durable, dumb as a sack of pickled turnips,' fairly big, and secreting acid from their fingers. Lethargic at first, one turns berserk the instant it can't board past Carl's door wedge — and the train's lethal doors shear its acid arms clean off (and bisect a second), leaving sizzling gore.
Carl loots the acid-dripping arms as alchemical supplies.
Large green-skinned, fish-like humanoids with huge milk-white eyes and webbed, acid-secreting hands, wobbling on the platform before turning violent.
An acid-handed platform brute that dies against Carl's barricade and the trains' guillotine doors.