What kind of trees are these?

The gray smooth bark looks like maple to me. Not sure about the other wood. It will be good after being split and stacked for a year.

Looks like two types of maple (silver and sugar) with a dose of english ivy.

The tree with the smooth gray bark is Red Maple, and so is the one with the ivy stuck to it. The brown-barked tree I can't tell.

I do know that it is good to burn once it is dried. Split it, stack it, and burn next winter and you'll be fine. Most wood is pretty good after a year of seasoning, although oak and a few others tend to take longer. You don't have oak in that picture.

My vote for the smooth is silver maple but it's hard to be sure on anything without seeing the leaves.

Technically, they are all hardwood, yes. If it's silver maple, it will dry fast but have less BTU than many other hardwoods. Still, well worth burning. Some people will call a low quality hardwood a softwood but that's not correct and I got caught on that a few weeks back. Having a variety of wood species is better IMHO so you can load the stove for either a long, slow burn or a fast, hot one.

Its wood that will be seasoned by next fall and thats a good thing. So its a great find. Dont know what the other lighter colored tree is (the darker gray is the Red maple). But the wood looks like a medium seasoning type.
No pine, no poplar.
Softwoods are technically trees that have needles and dont go dormant (and shed their leaves) . That is an unscientific explanation of the scientific division between the 2 groups. It also has to do with seed and/or pinecones too.

Looks like some gum in there too