Frog Planter. 15" x 12" x 10.5". Grateful For Any Info Regarding This Lovely Old Thing

[emuwren1]

Internet search turns up nothing. I can't find another frog planter like this one.

Please share your knowledge, thoughts, ideas as to its origins.

There's felt glued to the bottom, and it's really stuck on there. I can't feel any indentations or other indications of markings on bottom.

I believe the frog is at least 30 years old. 15" L x 12" W x 10.5" H

Thank you.