The past tense of talk the hind legs off a donkey is talked the hind legs off a donkey.
The third-person singular simple present indicative form of talk the hind legs off a donkey is talks the hind legs off a donkey.
The present participle of talk the hind legs off a donkey is talking the hind legs off a donkey.
The past participle of talk the hind legs off a donkey is talked the hind legs off a donkey.