Amacchiante:  [amaro] "bitter" + [macchiante] "staining". (Or some derivation from [amare] "to love".)
Zannagro:     [zannare] "to maul, to bite" + "agro" [sour, acidic].
Ditosto:      Probably in part from [tosto], of various meanings but esp. "fast" or "tough". The first
              component [could] be [Dite].
Gaudanno:     Possibly a portmanteau of [gaudente] "pleasure-seeker, hedonist" or [gaudioso] "joyful" with
              [anno] "year" or [danno] "damage; mischief".
Algerasso:    [Algeri] "Algiers" or the archaic word [algente] "cold, chilly" with ... one of several words,
              so let's go with [satanasso], "devil".
Pelingua:     [lingua] "tongue, language". The initial component is obscure.
Strugnello:   [struggere], "to melt; to consume slowly" + [agnello], "lamb". My, what a pleasant image.
Buscaglitore: [buscare] "to procure, to get" + [raccoglitore] "collector, reaper" or "folder, album".
Vetrompina:   [vetro] "glass" + [rompere] "to break" + [-ina] feminine diminutive suffix.
Lentoleone:   [lento leone] "slow lion".
Baciaratto:   [baciare] "to kiss" + possibly [ratto], of several meanings: "swift", "abduction", or "rat";
              alternatively, perhaps [attratto] "attracted".
Rumogatta:    [rumore] "rumor" + [gatta] "female cat; sex kitten".
Mendicante:   Uniquely, this is a word: [mendicante], "begging".
Scarbagna:    [bagnare] means "to soak; to bathe"; the [scar] component may come from any of several words.