"They are long swords."
Yes. Pōnta is they.
I believe the (nominative) pronouns are usually omitted. (Hmm, is it true of all verb tenses and moods that the nominative pronouns can be omitted? I think it has seemed that way, but I can't state it absolutely, and anyway they do show up from time to time.)
But anyway, these are the (usually omitted) nominative pronouns:
- nyke I
- ao you (singular)
- ziry he, she, it (solar and lunar)
- ūja it, he, she (terrestrial and aquatic)
- īlon we
- jeme you (plural)
- pōnta they
There is a more complete chart covering the variations in all the High Valyrian cases at: https://wiki.dothraki.org/High_Valyrian_Pronouns