New Troop idea: rats

How much do you hate using Giants and they just get lauched by spring traps or your troops get blown away by bombs? Well with rats they can "sniff" out those traps and get lauched or blown away by the spring traps or bombs. The rats would be able to dig under the walls to get the traps behind the walls. The upgrades are just pictures I found and what they could look like through the upgrades
Lvl 1:Attachment 100739 just a plain mouse.
Lvl 2:Attachment 100740 increased health and can last 2 bombs.
Lvl 3:Attachment 100741 increased sniffing and takes the shortest path, now able to defect air traps
Lvl 4: I couldn't get the picture in but it would look like speedy from loony toons. He would be able to pass 1 trap without losing life.