After torterra is able to learn it, if you select no then you can use a heart scale and then teach it the move using the heart scale tutor
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at lv one . check marriland and serebii or bulbapedia
On a normal level-up scale, Torterra learns Wood hammer at lvl 1 (!) so therefore you need to bring it to a move tutor with a Heat Scale to relearn the move.
Sudowoodo learns Hammer Arm at level 47 and Wood Hammer can be learned by going to the Move Reminder. This applies for Generation VI games and may not work in older generations.
Becouse axe is more sharper than hammer. Hammer would need much much more power to split wood.
When technically he learns it at level 1 or 0 or something, but he lears 5 moves at that level. He doesn't get woodhammer. The only way is, depending on your version, to take it to the move relearner. Diamond & Pearl: Pastoria HGSS: Blackthorne, I dont know about earlier games.