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While I was kibbing, with four cards to play, South as declarer claimed all the remaining tricks, with West on lead. The claim was incorrect as the defense had one more trick, provided he cashed the winning trick. The claim was rejected and West was asked to continue. West, even with all the cards exposed, most definitely, did not see the winning defence and was dithering and procrastinating. After a while, East prompted him to lead a particular card, which resulted in one more trick for the defense. My question is whether East as the partner of the person on lead can prompt West to play a particular card? Is it legal and is it ethical?

This should be quite easy, especially when you do not want to use 4!C as gerber.. 1N - 4!C asks 1N opener to transfer to !D, over which you bid 4!H or 4!S, the suit in which you want to play

Always say "Very Well Played" or "Excellent Play" to partner when partner makes a redoubled contract with or without overtricks, or when the opponents are humbled in a doubled contract, even if there was nothing special to do or if very ordinary play achieved the result. Nobody asked the opponents to bid an unmakeable contract or to double an easy contract. If it rubs them the wrong way, so be it :)