sandfish.

Any member of the genus Gonorynchus (also called beaked sandfishes), long, thin ray-finned fishes (family Gonorychidae)

Any of several marine fishes that burrow into sandy seabeds in Trichodontidae, a family of perch-like fish

Any of several marine fishes that burrow into sandy seabeds of species Awaous tajasica, usually sand fish, a species of goby fish (family Gobiidae)

Any of several marine fishes that burrow into sandy seabeds of species Malacanthus plumieri (sand tilefish, family Malacanthidae)

Any of several marine fishes that burrow into sandy seabeds of species Diplectrum formosum (sand perch, family Serranidae)

Other animals that notably burrow in sand: sandfish skink (Scincus scincus), a land-dwelling lizard that swims in sand

Other animals that notably burrow in sand: a sea cucumber of species Holothuria scabra or Thelenota ananas.