The green rhino had weird armor and could shoot from its open ended horn there was a family of 3 a lady a man and a boy and there where these two puddy things that made a bebebebebe noise and the shape shifted one was small the other was larger

Try,.

Herculoids

The Herculoids lived on a savage alien world that was often
On the verge of being conquered by various alien baddies.
Zandor was lord of this jungle world. He kept the invaders at
Bay with help from his wife Tara and Dorno his son and his savage
Alien animal friends.

Igoo the rock ape provided the muscle.
Zok the space dragon provided help from the air.
Tundro was a beast that was part rhino part triceratops.
It served as an armored living tank, and there were two
Stretching amorphous creatures Gloop, and Gleep.

Few would deny that the Herculoids rocked.