From Wiktionary, the free dictionary
دَبَبْتُمْ • (dababtum) (form I) /da.bab.tum/
- second-person masculine plural past active of دَبَّ (dabba)
دببتم (form II)
- دَبَّبْتُمْ (dabbabtum) /dab.bab.tum/: second-person masculine plural past active of دَبَّبَ (dabbaba)
- دُبِّبْتُمْ (dubbibtum) /dub.bib.tum/: second-person masculine plural past passive of دَبَّبَ (dabbaba)