Pushing food out with tongue

Yes, he probably just doesn’t like the taste or the texture. Totally normal. You can just keep trying him on the same foods, it often takes several tries before they like something.

Some textures, especially anything starchy like potatoes, sweet potatoes can be more difficult to swallow so it's normal to push the food out.

Food out of a jar often has a watery texture, not starchy or sticky. Just be persistent with it, he'll get there eventually.

It's just odd as sometimes he likes it and eats it straight away, then he can eat the same food another day and decide he doesn't like it! welcome to the world of babies

I’d try not to sweat over what he eats in a day (or you’ll go mad). Instead try to look at what he eats over a week. Mine would enthusiastically wolf down a meal and the next time refuse to even touch it. Think it’s pretty normal

How is he with finger foods btw? My DS could be fussy with purees and mashed food but would eat the same things as finger foods.

Have you tried giving him a fish finger to try or a strip of chicken to chew on? He may like it as a finger food