The only emoji that comes close to a crow is probably the black bird ⬛ (edit: hn does not seem to render this?). Unfortunately, it's a joined letter and therefore can't be parsed/typed that easily.
Other than that the combinators that I would have liked to match are vireo, warbler, thrush, lark, jay, hummingbird, (gold-)finch and becard - all of these don't have emojis.
Yes, the initial idea[1] was proposed by SCKelemen in 2021. The current design and implementation was created by me a few days ago. Basically everything in the language is up for discussion.
Other than that the combinators that I would have liked to match are vireo, warbler, thrush, lark, jay, hummingbird, (gold-)finch and becard - all of these don't have emojis.