The haiku observation is an interesting one:
"Likewise, he discovered that the contrast of two seeming opposites was a common feature in haiku. Ginsberg used this technique in his poetry, putting together two starkly dissimilar images: something weak with something strong, an artifact of high culture with an artifact of low culture, something holy with something unholy."
I think some of these broken metaphors could be turned into some sort of haiku-like poem, especially if we ignore the requirement to reference a season somehow, though it would still take some sort of additional work to add something to tie them together more thoroughly than the metaphor does, some third component a poet uses to glue the two bits together in some interesting way.
tree roots sheltering
river trout find safety but
growth is treacherous
Eh. I'm not a poet. And I still just chucked the "Redwood" part. But maybe you can see how I also added a bit of a concept in there to tie it together. But then, of course, it's no longer a metaphor, it's a poem. It's not referencing an experience we've all had and transferring that on to something else, I'm creating a new experience. Very different.
Author here - just wanted to clarify in case there is any confusion that those two (intentionally bad/weird) figures of speech about the echo and the trouts in the redwood roots were human written, by me! I wrote them as parody of an AI trying to do "literary" writing. The actual (probable) AI written excerpts are below that part.
I was thinking about the immortal Twin Peaks line "there's a FISH... in the PERCOLATOR" when I wrote the trout one.