Lepadichthys frenatus is pale pinkish to orange in colour and has a dark reddish stripe which runs from the snout through the eye and across the cover of the gills.

[3] Compared to other clingfishes the sucker disc is medium in size and this species grows to a Total Length of 4.9 to 5.8 centimetres (1.9 to 2.3 in).

[2] Lepadichthys frenatus occurs in the western Pacific Ocean from Japan to Australia, east to the Pitcairn Islands.

[2] Lepadichthys frenatus occurs in coral and rocky reefs, where it frequently shelters at the base of sea urchins belonging to the species Diadema setosum.

[3] Lepadichthys frenatus was described in 1904 by Edgar Ravenswood Waite with a type locality of Lord Howe Island.