The substance visible on the Pykes' hands and mouth are stains from the illegal spice they trade in.
"Stuka Crispo" translates from Huttese into English as "Death Watch."
The Black Sun were first introduced in Shadows of the Empire novel/game/comic in 1996 for the Expanded Universe. The Black Sun here share the same Falleen leadership and their symbol.
Death Watch uses new, smaller versions of the Kom'rk (aka Gauntlet) assault ships secretly built by rogue engineers within MandalMotors.
The 2021 book "The Art of The Mandalorian" revealed that the Pyke Syndicate was originally created for the live action series Star Wars: Underworld and was 'planted' in the Clone Wars series so it could pay off later. However in 2010 the underworld series was put on hold due to budgetary concerns and remains unfinished. The Pykes did make several more appearances in this series as well as Solo: A Star Wars Story (2018).