Cornelia Van Auken Chapin (August 7, 1893-December 4, 1972) was an American sculptor known for carving into stone directly without preliminary models or sketches.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Cornelia_Van_Auken_Chapin

Cornelia Van Auken Chapin at work on her Young Elephant
1939 / Photograph by Alfred Eisenstaedt / Archives of American Art, Smithsonian Institution, DC

Cornelia Van Auken Chapin on Artnet: http://www.artnet.com/artists/cornelia-van-auken-chapin/

Further reading:
https://www.craryartgallery.org/cornelia-chapin.html
https://www.associationforpublicart.org/artwork/giant-frog/
https://www.filmpreservation.org/blog/2021/3/25/artist-s-spotlight-cornelia-chapin