[1] From the scholia to Aristophanes, Knights 539; see already under kappa 2318. Crates (kappa 2339) is the subject of the verse involved: "kneading most ingenious notions from a quite loud (krambotatou) mouth". See further, next note
[2] "Air-dried" is from Hesychius"; "useful" is from the scholia, which still explain this as a pun from "cabbage", and is unlikely to display deep understanding of the text.
The headword κραμβοτάτου is obscure, evidently. As stated, it is glossed in Hesychius as καπυρός "air-dried" in this passage (hence its secondary meaning "blight in grapes" in Theophrastus); κραμβαλέος in Athenaeus means the same. This accounts for the gloss ξηροτάτου "driest". LSJ suggests "loud", based on Hesychius' gloss of κραμβός as "dried and parched" laughter; they add χαραμβαλιαστύς "loud laughter" in Hesychius (which they emend as κραμβαλιαστύς ). The passages in Hesychius alone do not seem to warrant this extension, but καπυρός is also used to mean "loud" or "clear-sounding" (LSJ s.v. II), via "crisp" or "crackling", and Theocritus, Idylls 7.37 refers to the καπυρός (clear-sounding) mouth of the Muses. Bekker suggests instead that the allusion may be to Crates as a drunkard, given how cabbage was eaten to prevent inebriation (kappa 2318).