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Hi Shelly,
A textbox is a Shape Object.
When we insert a textbox in a worksheet, Excel gives it a name such as "TextBox 1".
There is no excel formula which has any direct access to such Shape Objects.
However, using an Excel Macro, one can capture the text box content and paste it in desired cell.
If you are interested in such a Excel Macro (VBA code), then have a look at the following site.
They have shared one such sample macro.
https://www.extendoffice.com/documents/excel/4047-excel-convert-textbox-to-cell.html
Hope this Helps.