You can use can corn, not the cream style. Or you can probably find salmon eggs, (little red balls). Use as light a line as you can, ultra light works great, with small hooks. They are surprisingly easy to catch and generally pretty hungry/aggressive. It occurs to me that I am thinking about the rainbows stocked by
TPWD this time of year and you may not be. If you and I are on same page advice stands. If not, I defer to more knowledgeable folks
You probably should double check but seems like we used to have a trout stamp in addition to regular license. They may have relaxed this, but checking is free, being wrong and caught is expensive.
Have fun.