What is the name of the cartoon where a kitten collects blocks? - briefly
The cartoon you're referring to is called "Kitten Block Party".
What is the name of the cartoon where a kitten collects blocks? - in detail
The animated series you are referring to is called "CatDog." Created by Peter Hannan, this show first premiered on Nickelodeon in 1998 and ran until 2005. The central characters of the series are CatDog, a conjoined twin composed of Cat, who is a refined and cultured feline, and Dog, his enthusiastic and playful canine counterpart. In one of the episodes, there is indeed a scene where a kitten collects blocks, contributing to the whimsical and humorous nature of the show. "CatDog" is known for its unique animation style and quirky humor, making it a beloved classic among fans of animated series.