Don't know the singing tree.
Treants are tough- they've been depicted as sooo many different kinds of tree. I'd look at the scientific name of your favorite large tree and- as you intuit- add "sapiens" to the end.
Treants are tough- they've been depicted as sooo many different kinds of tree. I'd look at the scientific name of your favorite large tree and- as you intuit- add "sapiens" to the end.