The buses were donated to scout groups in south-east London
Two buses paid for with money from the Jimmy Mizen Foundation have been given to scout groups in south-east London.
The 16-year-old was murdered at a bakery near his home in Lee nearly a year ago.
Comedian Harry Hill handed over the keys to the "Jimmybuses" to the 21st Lewisham North Division and the whole Sidcup Scout District.
The Jimmy Mizen Foundation, set up by the teenager's family, raised more than £50,000 in donations to buy the buses.
The buses will carry scouts and young people on trips around the UK.
Jimmy, who was a scout, bled to death when the vessels in his neck were severed as he was hit by a glass dish in the bakery in Lee in May 2008, a day after his 16th birthday.
Jake Fahri, 19, also from Lee, was convicted of the murder and was jailed for life in March.
Ahead of the presentation, Jimmy's parents Barry and Margaret said: "We know they (buses) will enable many, many hundreds of young people to have the opportunity to take part in activities such as camping, canoeing, and rock climbing, that they would otherwise have not been able to, for many years to come.
"Childhood should be about adventure, discovery and friendship, not having to learn self-preservation on the streets."
Sixteen-year-old Jimmy Mizen had been a scout
Mr Hill, a friend of the Mizen family, handed over the keys to the Jimmybuses at Bellamy's garage, Burnt Ash Hill, in south-east London.
He said: "Jimmy's family have acted with great dignity since Jimmy's murder and I know it's their great desire that these buses will do so much to help many young people in the future."
Accepting the buses, Chris Foster from the Scout Association said: "It is a tragic situation that the Mizens lost their son.
"The generosity of the scheme is absolutely amazing and crucial for allowing more people to have fun and adventure through scouting."
Local scouts will get to ride the buses on Saturday to attend a camp.