Can you convert a TTF file to a DWG file? Thanks.

The simplest way for converting fonts to geometry is to use the TXTEXP command from Express Tools.
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Select the text you have just created by clicking on it.

Type the command "TXTEXP" and hit "Enter" on your keyboard. To enter any command into AutoCAD simply begin typing as this will automatically enter your text into the command bar.

I wonder if there is a font editor that works with TFF and SVG.

FontForge