Little bill is a Animation about a Little child who Learns things and aired on Nick Jr. In 1999, There was a Japanese Dub and aired on Nick Jr, No clips have been surfaced, only a promo for the dub has been found. And, When Nickelodeon japan shut down, Some shows have been moved, But this was not and as a result, It did not even rerun and Most Likely to never be found. EDIT 1: The Promo was revealed to be sourced from a show called Wonderful World of Alex Ad break.
Link to the promo: