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foam, vapor, smoke, scum; this is part of the name for tin (amochitl) and it appears in the Florentine Codex, Book 11, f. 215r., but translations vary.
See also the suggestion of a type of tree in the attestations.
See an image that represents mochitl in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present).
There is also a tree called the cuamochitl, cuauhmochitl, or guamochil, and it has edible seed pods. The origin of the term, which might help explain the "-mochitl" part remains elusive.
Antonio Peñafiel suggests "huey mochitl" as the source, and supports the idea that the mochitl is a tree.