Yes, but it is more difficult than jamming a typical radio antenna because the starlink uses a directed beam rather than a omnidirectional radio broadcast. This either requires enormous amounts of power, targeting the satellite itself with a directed radio beam, or getting between the satellite and the ground station by bouncing a signal off the ionosphere.

The above is for jamming directed beams in general. It is likely that starlink has a number of other jamming countermeasures.

I hear after the Ukraine war, Starlink became very good at thwarting jamming. I am confident the Iranians are not as sophisticated as the Russians in than front.

Yes, with the caveat that you'll need decent line of sight to it.

I've got to think it's easy to find starlink receivers--I know they use a directed beam but they must give off a bunch of lateral noise, right? Or does Starlink use the same frequency bands as other common equipment such that it would be difficult to distinguish starlink signals from others? If the government was motivated they could surely start finding these receivers, right?

Destroy the satellites? I mean all that have to do is screw up the trajectory of some of the satellites to cause exponential collisions...