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If you remember, pippin and merry could both understand orcs
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Yes, that's true. But they were certainly of different tribes, some being Orcs of Mordor and others being Orcs of Isengard. There were also Moria Orcs present. In
The Uruk-Hai, we are told:
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To Pippin's surprise he found that much of the talk was intelligible; many of the Orcs were using ordinary language. Apparently the members of two or three quite different tribes were present, and they could not understand one another's orc-speech.
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In fact, earlier, one of the Orcs (Grishnakh, I think) had "passed into a long angry speech in his own tongue" while talking to Pippin.
As for Sam, it may be that the Ring enabled him to understand Gorbag and Shagrat talking in their own tongue (they were both senior Orcs of Mordor and so might well have shared a language), or perhaps he only imagined that it did whereas they were in fact using the Common Speech. The account is, after all, written from Sam's perspective.
Later, when he is no longer wearing the Ring, he is able to understand Shagrat speaking to Snaga. But, as has already been said, Shagrat was a Captain and Snaga only a slave, it is unlikely that they shared a common language being from different "castes". Later, when they are travelling through Mordor, Frodo and Sam are able to understand the conversation between a "big fighting-orc" and a tracker:
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As usual, they were quarrelling, and being of different breeds, they used the Common Speech after their fashion.
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This confirms that there were different breeds of Orc within Mordor and that they used different languages. And this is probably why Frodo and Sam were also able to understand the "slave-driver" Orc who mistook them for one of the "gang of smaller breed" when they fell in with the line of Orcs marching to the front.
It is also worth noting that, in the Tower of Cirith Ungol, Sam is able to understand Shagrat's triumphant address to Gorbag after he has slain him. Perhaps Shagrat wanted others such as Snaga to hear and understand him, so as to instill fear in them. Or perhaps he just carried on using the language in which he had been conversing with Snaga.
In any event, in most of the situations where the Hobbits are able to understand the Orcs, it is because they are of different breeds and therefore conversing in the Common Speech. The only real exception is when Sam overhears Shagrat and Gorbag talking. Either they were speaking in their shared language and the Ring allowed Sam to understand, or they were speaking in the Common Speech and Sam only imagined that the Ring allowed him to understand them. Either explanation is possible.