This king is the pride of his peers on the safari

My plants, they are mostly shrubs, Woodless, no roots can grow deep. A certain line I exist above, With soil trapped in frigid sleep. My children three they are, and two are opposites too. The third sounds like where we got the words 'yodelayheehoo!'

A quiet guardian by the door, welcoming feet with a cozy embrace. Often found lying flat, yet stands firm against muddy intruders.

Firstly, a yellow spandex. Secondly, a one inch master. Thirdly, chucked chuck while playing a nunchuck.

You click me to hold the hatch, A metallic guardian, your safety catch. Attention robbers who come to snatch, With me in place, you've met your match.