You have some small swelling in the tongue, which according to your description is asymptomatic. Small nodular swellings are normally present on the tongue arranged in a sort of V at same level as tonsils. These are taste buds and are sometimes visible when you see your throat in the mirror. Voice problem is different and may not be related to your tongue problem. Get yourself thoroughly examined by ENT doctor and if what you call a pimple is a taste bud then be assured there is nothing to worry.