We don't have synonyms for ice-shelf yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ice shelf and rice-shell.
(n) :
Alternative form of ice shelf. [A thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface. Ice shelves are found in Antarctica, Greenland, and Canada only.]
(n) :
Alternative form of ice shelf. [A thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface. Ice shelves are found in Antarctica, Greenland, and Canada only.]