The Bosaki are insectile; the Traveller wiki has a drawing attached to the "Bosaki" article that is consistent with the appearance given in the JTAS article's attached artwork.
The Krotan (in their active adult phase, since they emerge from and return to sessile "shoals" like a sort of reef-shelf) look something like mushroom-crustaceans, with a top carapace-cap that they squat under when they're stubbornly refusing to acknowledge your existence. (Amusingly, they've done this to the entire Hiver and K'kree species, meaning they interact happily with the member/subject races and are basically allies of the Hive Federation, only in a "Garfield Minus Garfield" way).