tororo yam; grated yam
Refers to a type of yam (often Japanese yam or Chinese yam) that becomes slimy when grated, commonly used in the dish とろろ. The term とろろ芋 can refer to the yam itself or the grated preparation.
I like to eat grated yam over rice.
This tororo yam is very sticky.
山芋 is a broader term for wild yam, while とろろ芋 specifically refers to the type used for grated yam dishes.
長芋 is a common variety of yam often used as とろろ芋, but とろろ芋 can also refer to other sticky yam varieties.
Standard kanji-kana mixed spelling for this yam variety.
Kana spelling is common in everyday writing, especially when the kanji are obscure.
Rare kanji spelling using 薯蕷 (yam) + 芋 (potato).
Very rare kanji spelling; 藷 is an uncommon character for potato/yam.
The word とろろ is an onomatopoeic or mimetic word for the slimy, sticky texture of grated yam. 芋 means 'potato' or 'tuber'. The kanji 薯蕷 are ateji for yam, and 藷 is a rare character for potato/yam.