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Where can I get these? Any thoughts on scratch building?

The only 'official' ones come with the Tankbustas, but just take any squig (or grot!) model and stick some bombs/grenades onto it.

The new Night Gobbos squigherd, plastic rod, and a few minutes of effort is all you need.

Or go for counts-as, e.g. tiny robots or grots clutching an armful of grenades or dynamite