The correct conjugation is: nosotros tenemos muchos amigos. The other options (teneremos, tenimos, tenamos) are incorrect because they are words that don't exist in Spanish at all. The conjugation of the verb tener (to have) is:
<u>yo tengo</u>
<u>tú tienes</u> / vos tenés ("vos" only applies in some countries as Argentina and Uruguay)
