Antioch Publishing produced a line of Muppet bookmarks in 1982.
Kermit the Frog: "Howdy! Time for some ridin' ropin', and readin'..."
Miss Piggy: "Keep reading! I can't wait till you get to the part about moi!"
Animal: "My Bookmark - Mine! Mine! Mine!"
Fozzie Bear: "Where do bears go to read? To the Libeary! Wocka! Wocka!"