Osborne does not appear on "Skeeter" as it is a remix of the song "Just Another Story About Skeeter Thompson" that Grohl recorded for his Pocketwatch solo album. Skeeter Thompson was the bassist of Grohl's old band Scream.
"The whole idea [to do Kiss-esque solo albums] was a joke that went out of control. Mine was recorded with Dave Grohl, who I haven’t talked to in years. I have no idea what he’s doing. <...>."