Anything that generates heat can power a steam engine. All electronics do, so if you got enough of them in a pile, yes you could power a steam engine.
It sounds more like you’re asking if it could provide the steam *directly*. Most of them are ultrasonic diffusers so no. Some of them do heat the water and these ones can generate some *small* pressure. This pressure *could* be tapped to spin a turbine.
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