mouse is géri

géri = mouse
alternate spelling: gehri

Some things Google found for "geri":
Geri is an uncommon feminine first name which can be short for Geraldine. Geri is an unusual last name. In Turkish geri means back, rear, reverse. In Portuguese a form of the verb to manage, to administer. Geri is the name of places in Turkey, Sudan, Georgia, Indonesia, Nigeria, Pakistan, and Russia.

Word derivation for "mouse" :
Hungarian = egér
Finnish = hiiri (which I transliterate to híri)
Samgur = géri

bear is madu

madu = bear
alternate spelling: maduh

Some things Google found for "madu":
Madu is an unusual to uncommon last name. Madu is an unusual masculine first name. In Indonesian madu means honey. In Estonian madu means snake. Madu Station is a station on the Seoul Subway Line 3 in South Korea. Madu is the name of places in China, Indonesia, South Korea, Mozambique, and Sierra Leone.

Word derivation for "bear" :
Hungarian = medve
Finnish = karhu
Samgur = madu

This Samgur word takes consonants from the Hungarian word, and vowels from the Finnish word.