Researching further, seems like Ryouko Oneesan's quite the expert in this field, with CDs and even DVD concerts of her wonderfully warm and cute Children's songs...
I have to admit, I watched a few of these videos over and over again! Everyone sing along with Ryouko Oneesan now: ♫"Panda, Usagi, Koala..."♫ AHAHA
PS: I didn't realize that Ryouko spelled her name in all hiragana characters, so it's presented like this:つのだりょうこ...Too bad, If I had, I might have noticed that they DID show her name on the VS Arashi show, as shown here on her crushing Rolling Coin Tower Defeat:
Funny, when I first saw her on the VS Arashi show, I told Car that "there's this one girl in the Oniisan Oneesan group that I would have TOTALLY had a crush on as a kid watching the show". Turns out I developed a crush on her anyway! LOL
Ryouko Tsunoda Official Site SUN SMILE
Ryoko Tsunoda Blog Jugem