An impact-detonated bomb delivered by diving through a monster's mouth like a trick poodle through a hoop.
Cornered by a Jabbering Jibber-Jabber between two cold engines with his invisibility blinking out, Carl pulls an impact-detonated hob-lobber, jumps and rolls, and leaps through the side of the monster's open mouth like a trick poodle jumping through a hoop, leaving the bomb behind. He dives flat and covers his head as the Jibber-Jabber chomps down on it. The monster explodes, showering body parts everywhere — and although the species is a splitter, none of the pieces get back up.
A hobgoblin-made thrown bomb that detonates on impact.
Carl's answer to a splitter monster: detonate it from the inside.