If you mean "to be astonished or bewildered":
* Astound
* Amazed
* Stunned
* Bewildered
* Discombobulated
* Confused
* Startled
If you mean "to play the word game Boggle":
* Word search (though this is a broader term)
* Scrabble (this is another word game, but similar in concept)
* Letter game
* Word puzzle
If you mean "to move your eyes quickly around":
* Glance
* Dart
* Sweep
* Gaze
If you mean "to look surprised":
* Stare
* Gawk
* Goggle
Please provide more context so I can give you a more accurate synonym!