Very easy versions, two of them (one higher, one lower). Check Them Out!
[ Tab from: https://www.guitartabs.cc/tabs/a/axel_f/crazy_frog_tab_ver_4.html ]
Lower:
e |---------------------------------------------------|
B |---------------------------------------------------|
G |---------------------------------------------------|
D |----------0-------2-----3-2-----2-2----------------|
A |--0-3-0-0---0---0---0-0-----3-0-----0-0-----2-0----|
E |--------------3-------------------------3-0--------|
Higher:
e |----------------------------------1-----------------|
B |------------------1-----2-1-----1-------------------|
G |----1-----3-----------------1---------------0-------|
D |--3---3-3---3-1-3---3-3-------3------3-3-3-1----3---|
A |----------------------------------------------------|
E |----------------------------------------------------|