There are plenty bands with this name.
These are photos from concerts where Howl played, so they may be of other bands that played the concert as well.
Wild Thing / Howl Sep 5, 1969 Island Park, New York, United States Uploaded by Zimtrim
Spooky Tooth / Terry Reid / Howl Aug 22 - 23, 1969 Island Park, New York, United States Uploaded by Zimtrim
iron butterfly / Howl / Rosicrucian Aug 13, 1969 Island Park, New York, United States Uploaded by Zimtrim
The Illusion / Howl / Rosicrucian Jul 19, 1969 Island Park, New York, United States Uploaded by Zimtrim
Chicago / Howl / Rosicrucian Jul 11 - 12, 1969 Island Park, New York, United States Uploaded by Zimtrim
Canned Heat / Howl / Senaca Jun 20 - 21, 1969 Island Park, New York, United States Uploaded by Zimtrim