Little Buckaroos

I was confused the other day when I read how the phrase "passing the buck" came into use,but the saying I was thinking of was "The buck stops here". So now in an effort to assist you in "getting all your bucks in a row" I will explain that confusion. "Passing the buck" in modern terms means to blame another for your own actions,it is often applied to political figures. The origin of the expression comes from the American Frontier days where a marker was used to indicate whose turn it was to deal (in a game of poker). The marker was often a knife with a buck horn handle (called a buck). If the player did not wish to deal he could "pass the buck" to the next player. It is also believed that this was how the dollar was nicknamed the buck. When the knife was eventually replaced with a silver dollar for the marker they kept the name of "passing the buck".
"The buck stops here" is a phrase that was popularized by President Harry S. Truman who kept a sign with that saying on his desk in the Oval Office. It refers to the fact that the President has to make decisions and accept responsibility for those decisions.
For the bonus I was going to throw in who first used the phrase "Little Buckaroos" but I couldn't find any claim to the origin, other than it came from a Spanish word for cowboy. Wasn't there a children's TV show in the late 1950's that referred to the audience as little buckaroos? Was it Captain Kangaroo?