Davey Russo is a Wagstaff School student who goes on the Haunted Hayride in "Pig Trouble in Little Tina." Jocelyn advises Tammy that since his name rhymes with gravy she should make out with Jason Kozlowski.
He may be related to Walter Russo, an unseen character mentioned in "Friends with Burger-fits" as Bob's best friend despite not speaking in six years.