Spiny orb-weaver, Gasteracantha cancriformis
The spider you are describing is the Golden Silk Orb Weaver spider (Nephila clavipes). It is known for its large size, distinctive shape like a shield, golden yellow color, and unique back spikes. It is also recognized by its brown and yellow striped legs.
The bug that has spikes on its back is called a spiny leaf insect.
Kill the ants in your back yard.
The American lizard with a spiny crest along its back is called the Texas horned lizard, also known as the horny toad or horned frog. They are known for their unique appearance and diet of ants.
front=55 back =21A
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It is the marbled golden orb weaver.
The spider with a big brown ball on its back is likely a species of orb-weaver spider.
The spider you are referring to is likely the marbled orb-weaver spider (Araneus marmoreus). This spider is known for its bright orange coloration with black spots or diamonds on its back. It is a common sight in many regions, including Texas.
Iguana
I think it's a orb weaver. Harmless.