Space Academy and The Kids from C.A.P.E.R., but the 70s Live Action Kid Vid website gives some details about many that I never heard of. They vanished quickly, and left little trace on DVD, though you may be able to find uploads on youtube. Here are the four that look most interesting:
1. Ark II (1976-77): a sort of futuristic trucker show about Jonah (Terry Lester) driving around in a post-apocalyptic world solving people's personal problems, accompanied by his teen sidekicks Samuel (Jose Flores) and Ruth (Jean Marie Hon), plus a talking chimp. Terry Lester, who was gay in real life, went on to become a soap opera hunk on The Young and the Restless.
Child star Ted Eccles starred in In Cold Blood (1967) and My Side of the Mountain (1969), and muscled up to hug James Coburn in The Honkers (1972) and get terrorized by Scott Jacoby in Bad Ronald (1974).
The Bay City Rollers and Michael Lembeck (center) as Kaptain Kool (with the Kongs).
Craig Littler performed in many movies and tv programs, including Blazing Saddles (1974) and Laverne and Shirley. In the 1990s, he became the voice of Grey Poupon mustard in tv commercials ("Pardon me -- do you have any Grey Poupon?").