Elliptic curves over function fields with a large set of integral points

We construct isotrivial and non-isotrivial elliptic curves over ${\mathbb{F}}_q(t)$ with an arbitrarily large set of separable integral points. As an application of this construction, we prove that there are isotrivial log-general type varieties over \mathbb_{F}_q(t) with a Zariski dense set of separable integral points. This provides a counterexample to a natural translation of the Lang-Vojta conjecture to the function field setting. We also show that our main result provides examples of elliptic curves with an explicit and arbitrarily large set of linearly independent points.