No because the goomba is the average of two real opinions, and the strawman is a distortion/reduction of any opinion such that its easy to argue against.

On some level, yes, but having words to describe sub-sets can be useful too.

A "human" is just a "featherless biped", after all?

I think the Goomba Fallacy captures something helpful to me- it's helpful to know the origin of a straw man if you want to un-stuff one.

I think the Goomba is distinct. Strawman is disingenuously representing an argument, Goomba is assuming contradictions are coming from the same person, presumably b/c it's coming to the Goomba through the same app.