Nothing is known about them except they were hired by Tetti-Tatti to try and hunt down Willie to rescue the Opera Singer he apparently swallowed. However, they become so appreciative about his singing that they refuse to kill him, knowing he didn't swallow a singer. Later, when Tetti-Tatti harpoons him, the sailors, enraged and horrified, attack and restrain him.
All three look exactly the same--barrel chested with a large rounded jaw, shaven head, reddish-brown beards, wearing the typical sailor suits, with the typical buff male triangular body design.
Sailors shushing their boss
Sailors trying to harpoon Willie
The sailors, furious with Tetti-Tatti for shooting and killing Willie, beat him up.