Her birthday was on Jan. 29th.
Her real name is Toshi Furukawa. Last address: Tokyo.

She was nominated for the Hans Christian Andersen Award in 2000 and 2006.

From Bibelio, translated from the French:

"Toshiko Kanzawa is a Japanese author of children's books. She spent her youth close to nature on the island of Sakkhalin. She published her first book in 1958, Poems for Children. She went on to publish lullabies, picture books, toddler stories, novels and essays. Her books include Oof, the Bear Cub, Grandpa Frypan, The Hungry Pot, Moko the Rabbit, The Land of Silver Flames. She has also published memoirs: By the Stream and Singing the Same Song.."

https://jbby.org/wp/wp-content/uploads/2022/06/2017_2nd-edition.pdf
(brief bio & photo - scroll 1/4 down)

https://www.ibby.org/archive-storage/06_Bookbird_14579/25398/25398_PDF_00001.pdf
(longer bio; scroll down 2/3 - it starts with "I feel like a wrinkled dried persimmon having a good time in a pleasing breeze.")

http://japanesebookshelf.blogspot.com/2013/09/the-adventure-of-little-kamu.html
(about her first(?) book)

From 2022:

https://ihatov.wordpress.com/tag/toshiko-kanzawa/

Excerpt:

....In 1969 during China’s Cultural Revolution, Tang had been sent from Beijing to Siberia during the Sino-Soviet border conflict. He’d managed to avoid fighting, and was instead deeply impressed by Siberian flora and fauna. Decades later at Fukuinkan, he decided that the beauty of the nature of Siberia was what he wanted to create a book about. In searching for an author, he found Toshiko Kanzawa, a writer who had spent her childhood on Sakhalin, one of the Kuril Islands north of Hokkaido. Kanzawa had the background Tang was seeking. She knew about the native people on the island and the cultures of people of the northern territories. To write the book, Kanzawa traveled to Siberia to learn about the indigenous tribes on the continent, and it was about them that she wrote. Tang was delighted with Kanzawa’s story and writing. He pointed out that she had even included native language in the text.

The next job was to find an illustrator. Until the 1980s, we learned, Japanese picture books were illustrated almost exclusively by Japanese artists. Yet Tang was convinced that no artist could draw Siberia unless they had actually seen it. He eventually discovered an artist by the name of Gennadiy Dmitriyevich Pavlishin who lived in Siberia and was devoted to portraying indigenous peoples. Pavlishin agreed to illustrate the book, and Tang was excited when the artist finally contacted him to say that illustrations were ready...

https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1152&bih=591&q=Toshiko+Kanzawa&oq=Toshiko+Kanzawa&gs_l=img.3....843.843.0.1274.1.1.0.0.0.0.46.46.1.1.0....0...1ac.1.32.img..1.0.0.B_m1GVlhczM
(some book covers)

WRITINGS BY THE AUTHOR:

Little Kam's Adventures, Riron-sha, 1961.
Mischievous Rakko's Rokko, Akana-shobo, 1968.
Little Bear's Woo, Popula, 1969.

Dareka ga pal o tabeni kita, Fukuinkan-Shoten, 1970, translation published as The Selfish Old Woman, Bobbs-Merrill, 1971.
("A selfish old lady bakes a pie just for herself but runs into unexpected complications.")

A Boy's Adventures, Fukuinkan-Shoten, 1972.
Raintaro, Japan Publications, 1972.
The Foxes and the Horse-Dealer, Gakken, 1973.
("the horse-dealer tried to out-fox the fox; however, no one ever gets the best of the fox.")

Nohara no Hinamatsuri, Kin no Hoshisha, 1980.
Nezumi no Sumo, Kaiseisha, 1983.
Hyotanmen, Kaiseisha, 1984.
Oyasuminasai Mata Ashita: Osanai Kodomo no Tame no Shi no Hon, Nora Shoten, 1988.
Taran no Hakucho, Fukuinkan Shoten, 1989.

Inui Tomiko, Kanzawa Toshiko, Matsutani Miyoko (interviewed by Teruo Jingu), Kaiseisha, 1990.

Shikayo oreno kyodaiyo (Oh Deer, My Brother Deer!), Illus. Pavlishin, Genadii, 2004
Gorira no Rira-chan (Little Rilla, the Gorilla), Illus. Abe, Hiroshi, 2005

"Also author of Fushigi na komoriuta, 1968, Gin no honoo no kuni, 1972, Nezumi no ha to torikaekko, 1972, Sorairo no kotori, 1972, Kumo no Saburo, 1973, and Saru to kani, 1974."