Oxen is the plural form .
Also... maybe you're thinking of the expression "a yoke of oxen"?
A pair of oxen is called a yoke.
Ox is the singular of oxen. One Ox, two or more oxen.
A yoke is a bar or frame of wood by which two oxen are joined at the heads or necks for working together. Therefore, there are TWO (2) oxen in a yoke.
Oxen.
He hopped in the oxen cart and began on his journey. The two oxen struggled to pull the plough through the muddy field.
A yoke of oxen. Yoke: A crossbar with two U-shaped pieces that encircle the necks of a pair of oxen or other draft animals working together.
There is two.
At least two.
A pair of oxen is called a team of oxen or a yoke or oxen.
A yoke is a wooden beam which is used between a pair of oxen to allow them to pull a load (oxen almost always work in pairs). There are several types, used in different cultures, and for different types of oxen. A pair of oxen is also called a yoke of oxen, and yoke is also used as a verb: "to yoke a pair of oxen".http://en.wikipedia.org/wiki/Yoke
If you are reffering to what oxen and other work animals use, then yes. "The two oxen pulled the yoke together to move the plow"
No. Ox is singular, oxen is plural.