ZAngband had exploding monsters, though it was always the same monsters, and they would always explode when killed. I'm pretty sure ToME2 inherited them, though they may all have the SILLY flag (and thus require an appropriate birth option to be set for them to be generated).
Specifically I remember Snaga Sappers, Kamikaze Yeeks, Mine Dogs, and an entire series of elemental orbs that showed as "*".
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