Who’s that dippin’ into “Letterman” in a silly hat? Snoop Dogg! The Doggfather brought some humor to the streets of Manhattan with his colorful “Sakana-kun” headwear, purple adidas track pants, and house shoes while visiting the Ed Sullivan Theater for a taping of “The Late Show.” He was there with Quincy Jones to promote the legendary producer’s tribute album Q: Soul Bossa Nostra and ran into actor Russell Crowe. The episode will air tonight.