This is a mug shaped like an angler fish with an upthrust bottom jaw and pointy teeth sticking up.
A standard version of this design was first issued in an "Electric Blue" and teal by Tiki Farm (not marked for Three Dots and a Dash).
A red wipe-away glaze version was then released, the first version of this design exclusive to Three Dots and a Dash, Chicago, IL. This was followed by the gold version and then this green wipe-away version for Three Dots and a Dash.
Listed on their menu to serve the Caribbean Punch.
*NOTE: Tiki Soul released an unauthorized version of this design in the red wipe that looks very similar to the one issued by Three Dots and a Dash. However, it is marked "Tiki Soul" on bottom and not for the Chicago location.