I don't know, but on my baby the pediatrician called it drainage from the eye. We took our son for his check up and the pediatrician said he might have a blocked tear duct and that's why he had the drainage.
Boogers are mucus (myoo-kuss). Mucus is the thin, slippery material that is found inside your nose. Many people call mucus snot. Your nose makes nearly a cupful of snot every day. Snot is produced by the mucous membranes in the nose, which it moistens and protects.