[Indefinite]

Роханцы как раз говорят на языке, очень близком к древнему языку хоббитов.

Из Приложений:

From the lands between the Gladden and the Carrock came the folk that were known in Gondor as the Rohirrim, Masters of Horses. They still spoke their ancestral tongue...
<...>
There is no record of any language peculiar to Hobbits. In ancient days they seem always to have used the languages of Men near whom, or among whom, they lived. Thus they quickly adopted the Common Speech after they entered Eriador, and by the time of their settlement at Bree they had already begun to forget their former tongue. This was evidently a Mannish language of the upper Anduin, akin to that of the Rohirrim...

Вот еще цитата:

<Theoden, увидев хоббитов у Ортханка>: "Are not these the Halflings, that some among us call the Holbytlan?'
'Hobbits, if you please, lord,' said Pippin.
'Hobbits?' said Theoden. 'Your tongue is strangely changed; but the name sounds not unfitting so. Hobbits!"