I don't know much about the Ninja, but here is a list
of all secondary weapons useable by a lizardman fighter
afaik.
Dagger Skill Weapons:
Canezou Dagger
Dagger 1-4(1d4+0) Init:4
Baselard 1-7(1d7+0) Init:2
Main Gauche 1-5(1d5+0) Init:3
Poignard 1-
1d8+0) Init:2 TH:1
Serpent's Tooth 3-13(2d6+1) Init:3 TH:2 Poison%60
Mace & Flail Skill Weapons:
Diamond Eyes 7-22(3d6+4) Init:3 TH:2 Paralyze%20
Hammer 3-
1d6+2) TH:-1
Stun Mace 3-
1d6+2) Init:-2 DrainStamina%25
Flame Quencher Wand 1-
1d8+0) Init:5 TH:1 Paralyze%5
Notched Staff 1-3(1d3+0)
Shillelah 1-6(1d6+0) Init:1
Thunder Stick 4-10(2d4+2) Init:5 TH:1
Wand of Static 1-
1d8+0) Init:5 TH:1
Wand of Winds 6-10(2d3+4) Init:5 TH:1
Winter Wand 4-
2d3+2) Init:5 TH:1 Paralyze%15
Wooden Dowel 1-3(1d3+0)
Ymmu's Paw (cursed) 5-10(1d6+4) Init:5 TH:1 Hex%15
Axe Skill Weapons:
Bearded War Axe 1-6(1d6+0) Init:1
Throwning & Sling Skill Weapons:
all except Shuriken, Boomerang Shuriken, and Death Star
Helix