Don Messick
Donald Earle Messick (September 7, 1926 – October 24, 1997) was an American voice actor, known for his performances in Hanna-Barbera cartoons.[1] His best-remembered voice roles include Scooby-Doo; Bamm-Bamm Rubble and Hoppy in The Flintstones; Astro in The Jetsons; Muttley in Wacky Races and Dastardly and Muttley in Their Flying Machines; Boo-Boo Bear and Ranger Smith in The Yogi Bear Show; Sebastian the Cat in Josie and the Pussycats; Gears, Ratchet, and Scavenger in The Transformers; Papa Smurf and Azrael in The Smurfs; Hamton J. Pig in Tiny Toon Adventures; and Dr. Benton Quest in Jonny Quest. From Wikipedia.
Where to watch Don Messick’s work in 
Cambodia
Top 30 by popularity. Click any title to see exactly which OTT carries it in Cambodia.
The Flintstones
1960
Tom & Jerry Kids Show
1990
The Transformers
1984
The Smurfs
1981
DuckTales
1987
The Real Ghostbusters
1986
Super Friends
1973
The Jetsons
1962
Scooby-Doo and Scrappy-Doo
1979
Tiny Toon Adventures
1990
Scooby-Doo, Where Are You!
1969
Freakazoid!
1995
The Ruff and Reddy Show
1957
Scoob!
2020
Dastardly and Muttley in Their Flying Machines
1969
The Yogi Bear Show
1961
Droopy, Master Detective
1993
The Tom and Jerry Show
1975
The Flintstone Comedy Show
1980
Scooby's All-Stars
1977
The Transformers: The Movie
1986
Top Cat
1961
The Atom Ant Show
1965
Wacky Races
1968
The Huckleberry Hound Show
1958
The New Scooby-Doo Movies
1972
Heathcliff
1980
Godzilla
1978
The Gumby Show
1956
A Pup Named Scooby-Doo
1988