There are thingies called "battery placeholder", you will be able to find them easily[0], but I strongly doubt they are "safe" to lick/chew, probably safer than real batteries, still not advised for this purpose.

They are used in some cases to lower the total voltage of batteries in series, when one or two are replaced with higher voltage rechargeable ones, they are simply a straight connector.

[0] example:

https://www.sears.com/hisonde-5w9bpp9-4-pack-aa-battery-plac...