Welcome to the forum.
I too acquired a pool that had been neglected for longer than that. Frogs that were big enough for saddles. If all you want to know about is frog removal, I would guess an exterminator but I'd just try and net them and dump them elsewhere. If you don't like going in murky water with critters then lots of bleach should render them harmless and then go in with hip boots. As for the pool condition, need more details like is it a liner pool, equipment types, and some idea of the condition of the equipment. Being in Houston you probably don't have to worry about freeze damage as I don't think there was sustained below freezing temperatures this last winter. Look at the pipes that are above ground and look for splits from freezing, look at the gauge and see if it reads zero, anything else would be freeze damage but they're cheap. Look at the pump and filter for any obvious freeze damage problems. Breaks, splits and so forth. Look at the condition of the pool walls if it isn't a liner pool. This should be a start.
Al