Pomegranate tree with roundish, bumpy green growths on trunk

[marrib1]

Hi,

I have two 12 yr old Wonderful Poms.
I live in Phoenix.
They have developed a large number of green, bumpy growths on the lower part of their trunks. These two poms are pruned to have only one trunk (about 2ft up with no limbs). The growths can be removed with my hands. The growths can be broken apart. They seem to be all plant matter. No insects. All green inside. I can supply pics if you would like (on tree, off tree and broken apart).

Any ideas?

[marrib1]

Trunk. Growth on

[marrib1]

Trunk. Growth removed by hand. Not connected very hard

[marrib1]

Growth all woody inside and green.