Game has changed so much over the years as there many players these days play multiple positions. TPJ is a prop but has played a lot of 2nd row and prop for us maybe due to injury and not being fully fit.
Tapine from the Raiders likewise, he's played more 2nd row but is touted as being one of the much sort after props in the game.
Front rowers I feel should be big strong forwards who can get over the advantage line and hopefully break the defensive line
Second Rowers can be any size but need to be more agile than Front Rowers as they are the link to the backs and need a good passing game.
Tunks and Kelly come to mind as front rowers and Jason Smith one of my all-time favourite 2nd Rower / Lock.