There are at least five bands named Mamut.

Mamut is a band from Mercedes, Province of Buenos Aires, Argentina, which was formed at the initiative of Jano Pollero and Guillo Grassi. They debuted live in the city of Lobos in August 2003.
Gustavo Villalba is lead-singer, Gonzalo García Salabert on drums, Guillo Grassi on guitar and Jano Pollero on bass.
The first album was recorded in November 2004 in Rosario, Santa Fe. The broadcast cut was Asesinato en el circo.

The second is a hungarian Heavy Metal band! They started in 2007, from some ex-members of Sámán. Other information: www.mamutweb.extra.hu.

In 2017 a group of Belgian musicians and a Spanish singer formed the rock band Mamut (styled MAMVT) in the city of Leuven.
Colourful soundscapes combined with heavy in-your-face rock and a layer of catchy melodies, synths and clever songwriting. That is Leuven band MAMVT and their new record Ivory walls.
MAMUT started in 2017 with guitar players Jonas Delabie and Julien Mortier. As a duo with roots in Kortrijk, they quickly recruited Dylan Dujardin on bass and Spanish singer Yuri Murillo Mange as lead vocalist and hard-hitting drummer Kevin Gui to complete the ensemble based on free-flowing creativity and a get-shit-done attitude. When Dylan left the band at the start of 2020, they quickly got Wouter Put as their new bass player.
After a well-received first record, Crooked Salty Road, in October 2018, they are again laying it all out on the table on their new record Ivory walls (release: 15th of February 2020). Daring and without compromise, MAMVT is hungry to make an impact.

Then there is another band from Argentina which released the Contacto con el Diablo album in 1984, in a traditional metal vein.

Finally, there is the band Mamut hailing from Czech Republic that was active in the late 80's/early 90's. In a more heavy/power metal style, they recorded a demo called "The Waterloo" in 1989 and recorded a song for the "Death Metal Session" compilation album released by Direkt Records in 1990. They split up afterwards. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.