They are pretty much all equal.
Typhlosion has good attacking and bad defense.
Meganium has good defense and bad attacking.
Feraligatr is pretty balanced out.
Feralgiatr is better than Thyplosion. That's because Feraligatr is a water type and Thyplosion is a fire type. Fire beats water, like always!
Feraligatr is a great physical attacker and physical defender with a good physical movepool. Poliwrath is average all around, but it is bulkier than Feraligatr. I say Feraligatr is better, but Poliwrath does have a lot more moves available to it, and it's Water/Fighting.
Feraligatr
Feraligatr is a Water type pokemon.
Feraligatr cannot learn Sheer Cold.
Feraligatr learns crunch at level 32
Level 58 will feraligatr learn it
feraligatr learns hydro cannon at level 74
Feraligatr is #160 in the national pokedex, and it is a Water type Pokemon.
Feraligatr doesn't evolve. If you mean Croconaw, it evolves into Feraligatr at level 30.
you cant in platinum
Feraligatr cannot learn Ice Punch naturally however a Move Tutor can teach Feraligatr Ice Punch in "Pokémon Platinum," "Pokémon HeartGold" and "Pokémon SoulSilver."