I worked up a Working Draft for the Dragon Warriors'
Dragon Teeth. Is it acceptable?
New Magic Item
DRAGON TOOTH
Wondrous item, rarity by dragon: very rare for gold, red and silver; rare for black, blue, brass, bronze, copper, green and white
A dragon tooth is a reptilian fang three to six inches long, small enough to fit in a pocket. They are usually found in pairs or sets of four, all canine teeth from the jaws of a deceased dragon of young or adult age, and their command word is often a nickname of that dragon (e.g. "Emerald Emperor Salvia" for a set of green dragon teeth). Some legendary ancient dragons have had a score or even dozens of dragon teeth harvested from their remains, but the normal limit is four per dragon.
When activated by use of its command word, the tooth becomes a living creature, a dragon warrior whose type matches the tooth's dragon (black, blue, brass, bronze, copper, gold, green, red, silver, white). A dragon tooth may be used in one of two ways: it can become a dragon warrior immediately, or it can transform into a delayed-action trap that becomes a dragon warrior when triggered. See the individual dragon warrior entries for the creature's statistics.
The tooth's dragon warrior exists for 1 hour. At the end of this duration, the creature reverts to its tooth form and crumbles to dust, destroying the dragon tooth. It reverts to a tooth early if it drops to 0 hit points or if you use an action to speak the command word again while touching it.
To use a dragon tooth immediately, you use an action to speak the command word, crush the tooth, and then throw it to a point on the ground within 60 feet of you, where the tooth becomes a dragon warrior. If the space where the warrior would appear is occupied by other creatures or objects, or if there isn't enough space for the creature, the tooth doesn't become a dragon warrior. The dragon warrior is friendly to you and your companions and obeys your spoken commands. It speaks Common and Draconic, but the magic of the tooth allows it to understand commands given in any of your languages. If you issue no commands, the warrior defends itself but takes no other actions.
To use a dragon tooth as a trap, you use an action to speak the command word and then plant the trap, either by laying it onto a firm and level surface within 5 feet (floor, table, etc.), pushing it into earth within 5 feet, or sowing it onto plowed soil within 60 feet. You can use one action to activate multiple dragon teeth from the same set and lay them on a surface within an adjacent 5-foot square, but planting them may require additional actions: it takes one action to push [two?] teeth into earth within an adjacent 5-foot square, or one action to sow [four?] teeth onto plowed soil within a 60-foot cone. You can also use an action to move up to your speed and plant teeth from another location, allowing you to set dragon tooth traps at multiple positions. If you are killed or incapacitated, you will drop any trap-activated dragon teeth you have not yet planted, laying it onto a random surface within 5 feet.
Once planted, a trap dragon tooth will become a dragon warrior if it takes any damage or is stepped upon by a creature (including stepping on soil the tooth is buried under, which causes the warrior to sprout from the ground). The warrior attacks the creature that triggered the trap, fighting to the death. If the triggering creature flees, the warrior pursues it unerringly, sensing its direction as if it was using a locate creature spell. If another creature injures the dragon warrior, the dragon warrior views it as a new triggering creature and attacks them too, although it can only sense the location of the original triggering creature. If no triggering creature is alive, the warrior defends itself but takes no action.