Wednesday Trivia Question

What PBS Kids character has a toy panda named Ignaz Semmelweis?

Ignaz Philipp Semmelweis was a Hungarian doctor, who was an early pioneer of antiseptic procedures. Definitely NOT a household name, to be sure. But Semmelweis has his fans. One of these is a PBS Kids character who named his toy panda after the 19th-century scientist.

The character in question is the star of his own show, a PBS Kids series that still airs on Rootle even though original episodes ceased about ten years ago.

So who is it? What PBS Kids character has a toy panda named after 19th-century Hungarian physician Ignaz Semmelweis?